drivers/block/drbd/drbd_nl.c

   1 /*
   2    drbd_nl.c
   3
   4    This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
   5
   6    Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
   7    Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>.
   8    Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>.
   9
  10    drbd is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2, or (at your option)
  13    any later version.
  14
  15    drbd is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with drbd; see the file COPYING.  If not, write to
  22    the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  23
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/drbd.h>
  28 #include <linux/in.h>
  29 #include <linux/fs.h>
  30 #include <linux/file.h>
  31 #include <linux/slab.h>
  32 #include <linux/blkpg.h>
  33 #include <linux/cpumask.h>
  34 #include "drbd_int.h"
  35 #include "drbd_req.h"
  36 #include "drbd_wrappers.h"
  37 #include <asm/unaligned.h>
  38 #include <linux/drbd_limits.h>
  39 #include <linux/kthread.h>
  40
  41 #include <net/genetlink.h>
  42
  43 /* .doit */
  44 // int drbd_adm_create_resource(struct sk_buff *skb, struct genl_info *info);
  45 // int drbd_adm_delete_resource(struct sk_buff *skb, struct genl_info *info);
  46
  47 int drbd_adm_add_minor(struct sk_buff *skb, struct genl_info *info);
  48 int drbd_adm_delete_minor(struct sk_buff *skb, struct genl_info *info);
  49
  50 int drbd_adm_create_connection(struct sk_buff *skb, struct genl_info *info);
  51 int drbd_adm_delete_connection(struct sk_buff *skb, struct genl_info *info);
  52 int drbd_adm_down(struct sk_buff *skb, struct genl_info *info);
  53
  54 int drbd_adm_set_role(struct sk_buff *skb, struct genl_info *info);
  55 int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info);
  56 int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info);
  57 int drbd_adm_detach(struct sk_buff *skb, struct genl_info *info);
  58 int drbd_adm_connect(struct sk_buff *skb, struct genl_info *info);
  59 int drbd_adm_net_opts(struct sk_buff *skb, struct genl_info *info);
  60 int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info);
  61 int drbd_adm_start_ov(struct sk_buff *skb, struct genl_info *info);
  62 int drbd_adm_new_c_uuid(struct sk_buff *skb, struct genl_info *info);
  63 int drbd_adm_disconnect(struct sk_buff *skb, struct genl_info *info);
  64 int drbd_adm_invalidate(struct sk_buff *skb, struct genl_info *info);
  65 int drbd_adm_invalidate_peer(struct sk_buff *skb, struct genl_info *info);
  66 int drbd_adm_pause_sync(struct sk_buff *skb, struct genl_info *info);
  67 int drbd_adm_resume_sync(struct sk_buff *skb, struct genl_info *info);
  68 int drbd_adm_suspend_io(struct sk_buff *skb, struct genl_info *info);
  69 int drbd_adm_resume_io(struct sk_buff *skb, struct genl_info *info);
  70 int drbd_adm_outdate(struct sk_buff *skb, struct genl_info *info);
  71 int drbd_adm_resource_opts(struct sk_buff *skb, struct genl_info *info);
  72 int drbd_adm_get_status(struct sk_buff *skb, struct genl_info *info);
  73 int drbd_adm_get_timeout_type(struct sk_buff *skb, struct genl_info *info);
  74 /* .dumpit */
  75 int drbd_adm_get_status_all(struct sk_buff *skb, struct netlink_callback *cb);
  76
  77 #include <linux/drbd_genl_api.h>
  78 #include <linux/genl_magic_func.h>
  79
  80 /* used blkdev_get_by_path, to claim our meta data device(s) */
  81 static char *drbd_m_holder = "Hands off! this is DRBD's meta data device.";
  82
  83 /* Configuration is strictly serialized, because generic netlink message
  84  * processing is strictly serialized by the genl_lock().
  85  * Which means we can use one static global drbd_config_context struct.
  86  */
  87 static struct drbd_config_context {
  88         /* assigned from drbd_genlmsghdr */
  89         unsigned int minor;
  90         /* assigned from request attributes, if present */
  91         unsigned int volume;
  92 #define VOLUME_UNSPECIFIED              (-1U)
  93         /* pointer into the request skb,
  94          * limited lifetime! */
  95         char *conn_name;
  96
  97         /* reply buffer */
  98         struct sk_buff *reply_skb;
  99         /* pointer into reply buffer */
 100         struct drbd_genlmsghdr *reply_dh;
 101         /* resolved from attributes, if possible */
 102         struct drbd_conf *mdev;
 103         struct drbd_tconn *tconn;
 104 } adm_ctx;
 105
 106 static void drbd_adm_send_reply(struct sk_buff *skb, struct genl_info *info)
 107 {
 108         genlmsg_end(skb, genlmsg_data(nlmsg_data(nlmsg_hdr(skb))));
 109         if (genlmsg_reply(skb, info))
 110                 printk(KERN_ERR "drbd: error sending genl reply\n");
 111 }
 112
 113 /* Used on a fresh "drbd_adm_prepare"d reply_skb, this cannot fail: The only
 114  * reason it could fail was no space in skb, and there are 4k available. */
 115 int drbd_msg_put_info(const char *info)
 116 {
 117         struct sk_buff *skb = adm_ctx.reply_skb;
 118         struct nlattr *nla;
 119         int err = -EMSGSIZE;
 120
 121         if (!info || !info[0])
 122                 return 0;
 123
 124         nla = nla_nest_start(skb, DRBD_NLA_CFG_REPLY);
 125         if (!nla)
 126                 return err;
 127
 128         err = nla_put_string(skb, T_info_text, info);
 129         if (err) {
 130                 nla_nest_cancel(skb, nla);
 131                 return err;
 132         } else
 133                 nla_nest_end(skb, nla);
 134         return 0;
 135 }
 136
 137 /* This would be a good candidate for a "pre_doit" hook,
 138  * and per-family private info->pointers.
 139  * But we need to stay compatible with older kernels.
 140  * If it returns successfully, adm_ctx members are valid.
 141  */
 142 #define DRBD_ADM_NEED_MINOR     1
 143 #define DRBD_ADM_NEED_CONN      2
 144 static int drbd_adm_prepare(struct sk_buff *skb, struct genl_info *info,
 145                 unsigned flags)
 146 {
 147         struct drbd_genlmsghdr *d_in = info->userhdr;
 148         const u8 cmd = info->genlhdr->cmd;
 149         int err;
 150
 151         memset(&adm_ctx, 0, sizeof(adm_ctx));
 152
 153         /* genl_rcv_msg only checks for CAP_NET_ADMIN on "GENL_ADMIN_PERM" :( */
 154         if (cmd != DRBD_ADM_GET_STATUS
 155         && security_netlink_recv(skb, CAP_SYS_ADMIN))
 156                return -EPERM;
 157
 158         adm_ctx.reply_skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 159         if (!adm_ctx.reply_skb)
 160                 goto fail;
 161
 162         adm_ctx.reply_dh = genlmsg_put_reply(adm_ctx.reply_skb,
 163                                         info, &drbd_genl_family, 0, cmd);
 164         /* put of a few bytes into a fresh skb of >= 4k will always succeed.
 165          * but anyways */
 166         if (!adm_ctx.reply_dh)
 167                 goto fail;
 168
 169         adm_ctx.reply_dh->minor = d_in->minor;
 170         adm_ctx.reply_dh->ret_code = NO_ERROR;
 171
 172         if (info->attrs[DRBD_NLA_CFG_CONTEXT]) {
 173                 struct nlattr *nla;
 174                 /* parse and validate only */
 175                 err = drbd_cfg_context_from_attrs(NULL, info);
 176                 if (err)
 177                         goto fail;
 178
 179                 /* It was present, and valid,
 180                  * copy it over to the reply skb. */
 181                 err = nla_put_nohdr(adm_ctx.reply_skb,
 182                                 info->attrs[DRBD_NLA_CFG_CONTEXT]->nla_len,
 183                                 info->attrs[DRBD_NLA_CFG_CONTEXT]);
 184                 if (err)
 185                         goto fail;
 186
 187                 /* and assign stuff to the global adm_ctx */
 188                 nla = nested_attr_tb[__nla_type(T_ctx_volume)];
 189                 adm_ctx.volume = nla ? nla_get_u32(nla) : VOLUME_UNSPECIFIED;
 190                 nla = nested_attr_tb[__nla_type(T_ctx_conn_name)];
 191                 if (nla)
 192                         adm_ctx.conn_name = nla_data(nla);
 193         } else
 194                 adm_ctx.volume = VOLUME_UNSPECIFIED;
 195
 196         adm_ctx.minor = d_in->minor;
 197         adm_ctx.mdev = minor_to_mdev(d_in->minor);
 198         adm_ctx.tconn = conn_get_by_name(adm_ctx.conn_name);
 199
 200         if (!adm_ctx.mdev && (flags & DRBD_ADM_NEED_MINOR)) {
 201                 drbd_msg_put_info("unknown minor");
 202                 return ERR_MINOR_INVALID;
 203         }
 204         if (!adm_ctx.tconn && (flags & DRBD_ADM_NEED_CONN)) {
 205                 drbd_msg_put_info("unknown connection");
 206                 return ERR_INVALID_REQUEST;
 207         }
 208
 209         /* some more paranoia, if the request was over-determined */
 210         if (adm_ctx.mdev && adm_ctx.tconn &&
 211             adm_ctx.mdev->tconn != adm_ctx.tconn) {
 212                 pr_warning("request: minor=%u, conn=%s; but that minor belongs to connection %s\n",
 213                                 adm_ctx.minor, adm_ctx.conn_name, adm_ctx.mdev->tconn->name);
 214                 drbd_msg_put_info("minor exists in different connection");
 215                 return ERR_INVALID_REQUEST;
 216         }
 217         if (adm_ctx.mdev &&
 218             adm_ctx.volume != VOLUME_UNSPECIFIED &&
 219             adm_ctx.volume != adm_ctx.mdev->vnr) {
 220                 pr_warning("request: minor=%u, volume=%u; but that minor is volume %u in %s\n",
 221                                 adm_ctx.minor, adm_ctx.volume,
 222                                 adm_ctx.mdev->vnr, adm_ctx.mdev->tconn->name);
 223                 drbd_msg_put_info("minor exists as different volume");
 224                 return ERR_INVALID_REQUEST;
 225         }
 226
 227         return NO_ERROR;
 228
 229 fail:
 230         nlmsg_free(adm_ctx.reply_skb);
 231         adm_ctx.reply_skb = NULL;
 232         return -ENOMEM;
 233 }
 234
 235 static int drbd_adm_finish(struct genl_info *info, int retcode)
 236 {
 237         struct nlattr *nla;
 238         const char *conn_name = NULL;
 239
 240         if (adm_ctx.tconn) {
 241                 kref_put(&adm_ctx.tconn->kref, &conn_destroy);
 242                 adm_ctx.tconn = NULL;
 243         }
 244
 245         if (!adm_ctx.reply_skb)
 246                 return -ENOMEM;
 247
 248         adm_ctx.reply_dh->ret_code = retcode;
 249
 250         nla = info->attrs[DRBD_NLA_CFG_CONTEXT];
 251         if (nla) {
 252                 nla = nla_find_nested(nla, __nla_type(T_ctx_conn_name));
 253                 if (nla)
 254                         conn_name = nla_data(nla);
 255         }
 256
 257         drbd_adm_send_reply(adm_ctx.reply_skb, info);
 258         return 0;
 259 }
 260
 261 static void setup_khelper_env(struct drbd_tconn *tconn, char **envp)
 262 {
 263         char *afs;
 264         struct net_conf *nc;
 265
 266         rcu_read_lock();
 267         nc = rcu_dereference(tconn->net_conf);
 268         if (nc) {
 269                 switch (((struct sockaddr *)nc->peer_addr)->sa_family) {
 270                 case AF_INET6:
 271                         afs = "ipv6";
 272                         snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI6",
 273                                  &((struct sockaddr_in6 *)nc->peer_addr)->sin6_addr);
 274                         break;
 275                 case AF_INET:
 276                         afs = "ipv4";
 277                         snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI4",
 278                                  &((struct sockaddr_in *)nc->peer_addr)->sin_addr);
 279                         break;
 280                 default:
 281                         afs = "ssocks";
 282                         snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI4",
 283                                  &((struct sockaddr_in *)nc->peer_addr)->sin_addr);
 284                 }
 285                 snprintf(envp[3], 20, "DRBD_PEER_AF=%s", afs);
 286         }
 287         rcu_read_unlock();
 288 }
 289
 290 int drbd_khelper(struct drbd_conf *mdev, char *cmd)
 291 {
 292         char *envp[] = { "HOME=/",
 293                         "TERM=linux",
 294                         "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
 295                          (char[20]) { }, /* address family */
 296                          (char[60]) { }, /* address */
 297                         NULL };
 298         char mb[12];
 299         char *argv[] = {usermode_helper, cmd, mb, NULL };
 300         struct sib_info sib;
 301         int ret;
 302
 303         snprintf(mb, 12, "minor-%d", mdev_to_minor(mdev));
 304         setup_khelper_env(mdev->tconn, envp);
 305
 306         /* The helper may take some time.
 307          * write out any unsynced meta data changes now */
 308         drbd_md_sync(mdev);
 309
 310         dev_info(DEV, "helper command: %s %s %s\n", usermode_helper, cmd, mb);
 311         sib.sib_reason = SIB_HELPER_PRE;
 312         sib.helper_name = cmd;
 313         drbd_bcast_event(mdev, &sib);
 314         ret = call_usermodehelper(usermode_helper, argv, envp, 1);
 315         if (ret)
 316                 dev_warn(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
 317                                 usermode_helper, cmd, mb,
 318                                 (ret >> 8) & 0xff, ret);
 319         else
 320                 dev_info(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
 321                                 usermode_helper, cmd, mb,
 322                                 (ret >> 8) & 0xff, ret);
 323         sib.sib_reason = SIB_HELPER_POST;
 324         sib.helper_exit_code = ret;
 325         drbd_bcast_event(mdev, &sib);
 326
 327         if (ret < 0) /* Ignore any ERRNOs we got. */
 328                 ret = 0;
 329
 330         return ret;
 331 }
 332
 333 static void conn_md_sync(struct drbd_tconn *tconn)
 334 {
 335         struct drbd_conf *mdev;
 336         int vnr;
 337
 338         down_read(&drbd_cfg_rwsem);
 339         idr_for_each_entry(&tconn->volumes, mdev, vnr)
 340                 drbd_md_sync(mdev);
 341         up_read(&drbd_cfg_rwsem);
 342 }
 343
 344 int conn_khelper(struct drbd_tconn *tconn, char *cmd)
 345 {
 346         char *envp[] = { "HOME=/",
 347                         "TERM=linux",
 348                         "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
 349                          (char[20]) { }, /* address family */
 350                          (char[60]) { }, /* address */
 351                         NULL };
 352         char *argv[] = {usermode_helper, cmd, tconn->name, NULL };
 353         int ret;
 354
 355         setup_khelper_env(tconn, envp);
 356         conn_md_sync(tconn);
 357
 358         conn_info(tconn, "helper command: %s %s %s\n", usermode_helper, cmd, tconn->name);
 359         /* TODO: conn_bcast_event() ?? */
 360
 361         ret = call_usermodehelper(usermode_helper, argv, envp, 1);
 362         if (ret)
 363                 conn_warn(tconn, "helper command: %s %s %s exit code %u (0x%x)\n",
 364                           usermode_helper, cmd, tconn->name,
 365                           (ret >> 8) & 0xff, ret);
 366         else
 367                 conn_info(tconn, "helper command: %s %s %s exit code %u (0x%x)\n",
 368                           usermode_helper, cmd, tconn->name,
 369                           (ret >> 8) & 0xff, ret);
 370         /* TODO: conn_bcast_event() ?? */
 371
 372         if (ret < 0) /* Ignore any ERRNOs we got. */
 373                 ret = 0;
 374
 375         return ret;
 376 }
 377
 378 static enum drbd_fencing_p highest_fencing_policy(struct drbd_tconn *tconn)
 379 {
 380         enum drbd_fencing_p fp = FP_NOT_AVAIL;
 381         struct drbd_conf *mdev;
 382         int vnr;
 383
 384         rcu_read_lock();
 385         idr_for_each_entry(&tconn->volumes, mdev, vnr) {
 386                 if (get_ldev_if_state(mdev, D_CONSISTENT)) {
 387                         fp = max_t(enum drbd_fencing_p, fp, mdev->ldev->dc.fencing);
 388                         put_ldev(mdev);
 389                 }
 390         }
 391         rcu_read_unlock();
 392
 393         return fp;
 394 }
 395
 396 bool conn_try_outdate_peer(struct drbd_tconn *tconn)
 397 {
 398         union drbd_state mask = { };
 399         union drbd_state val = { };
 400         enum drbd_fencing_p fp;
 401         char *ex_to_string;
 402         int r;
 403
 404         if (tconn->cstate >= C_WF_REPORT_PARAMS) {
 405                 conn_err(tconn, "Expected cstate < C_WF_REPORT_PARAMS\n");
 406                 return false;
 407         }
 408
 409         fp = highest_fencing_policy(tconn);
 410         switch (fp) {
 411         case FP_NOT_AVAIL:
 412                 conn_warn(tconn, "Not fencing peer, I'm not even Consistent myself.\n");
 413                 goto out;
 414         case FP_DONT_CARE:
 415                 return true;
 416         default: ;
 417         }
 418
 419         r = conn_khelper(tconn, "fence-peer");
 420
 421         switch ((r>>8) & 0xff) {
 422         case 3: /* peer is inconsistent */
 423                 ex_to_string = "peer is inconsistent or worse";
 424                 mask.pdsk = D_MASK;
 425                 val.pdsk = D_INCONSISTENT;
 426                 break;
 427         case 4: /* peer got outdated, or was already outdated */
 428                 ex_to_string = "peer was fenced";
 429                 mask.pdsk = D_MASK;
 430                 val.pdsk = D_OUTDATED;
 431                 break;
 432         case 5: /* peer was down */
 433                 if (conn_highest_disk(tconn) == D_UP_TO_DATE) {
 434                         /* we will(have) create(d) a new UUID anyways... */
 435                         ex_to_string = "peer is unreachable, assumed to be dead";
 436                         mask.pdsk = D_MASK;
 437                         val.pdsk = D_OUTDATED;
 438                 } else {
 439                         ex_to_string = "peer unreachable, doing nothing since disk != UpToDate";
 440                 }
 441                 break;
 442         case 6: /* Peer is primary, voluntarily outdate myself.
 443                  * This is useful when an unconnected R_SECONDARY is asked to
 444                  * become R_PRIMARY, but finds the other peer being active. */
 445                 ex_to_string = "peer is active";
 446                 conn_warn(tconn, "Peer is primary, outdating myself.\n");
 447                 mask.disk = D_MASK;
 448                 val.disk = D_OUTDATED;
 449                 break;
 450         case 7:
 451                 if (fp != FP_STONITH)
 452                         conn_err(tconn, "fence-peer() = 7 && fencing != Stonith !!!\n");
 453                 ex_to_string = "peer was stonithed";
 454                 mask.pdsk = D_MASK;
 455                 val.pdsk = D_OUTDATED;
 456                 break;
 457         default:
 458                 /* The script is broken ... */
 459                 conn_err(tconn, "fence-peer helper broken, returned %d\n", (r>>8)&0xff);
 460                 return false; /* Eventually leave IO frozen */
 461         }
 462
 463         conn_info(tconn, "fence-peer helper returned %d (%s)\n",
 464                   (r>>8) & 0xff, ex_to_string);
 465
 466  out:
 467
 468         /* Not using
 469            conn_request_state(tconn, mask, val, CS_VERBOSE);
 470            here, because we might were able to re-establish the connection in the
 471            meantime. */
 472         spin_lock_irq(&tconn->req_lock);
 473         if (tconn->cstate < C_WF_REPORT_PARAMS)
 474                 _conn_request_state(tconn, mask, val, CS_VERBOSE);
 475         spin_unlock_irq(&tconn->req_lock);
 476
 477         return conn_highest_pdsk(tconn) <= D_OUTDATED;
 478 }
 479
 480 static int _try_outdate_peer_async(void *data)
 481 {
 482         struct drbd_tconn *tconn = (struct drbd_tconn *)data;
 483
 484         conn_try_outdate_peer(tconn);
 485
 486         kref_put(&tconn->kref, &conn_destroy);
 487         return 0;
 488 }
 489
 490 void conn_try_outdate_peer_async(struct drbd_tconn *tconn)
 491 {
 492         struct task_struct *opa;
 493
 494         kref_get(&tconn->kref);
 495         opa = kthread_run(_try_outdate_peer_async, tconn, "drbd_async_h");
 496         if (IS_ERR(opa)) {
 497                 conn_err(tconn, "out of mem, failed to invoke fence-peer helper\n");
 498                 kref_put(&tconn->kref, &conn_destroy);
 499         }
 500 }
 501
 502 enum drbd_state_rv
 503 drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force)
 504 {
 505         const int max_tries = 4;
 506         enum drbd_state_rv rv = SS_UNKNOWN_ERROR;
 507         struct net_conf *nc;
 508         int try = 0;
 509         int forced = 0;
 510         union drbd_state mask, val;
 511
 512         if (new_role == R_PRIMARY)
 513                 request_ping(mdev->tconn); /* Detect a dead peer ASAP */
 514
 515         mutex_lock(mdev->state_mutex);
 516
 517         mask.i = 0; mask.role = R_MASK;
 518         val.i  = 0; val.role  = new_role;
 519
 520         while (try++ < max_tries) {
 521                 rv = _drbd_request_state(mdev, mask, val, CS_WAIT_COMPLETE);
 522
 523                 /* in case we first succeeded to outdate,
 524                  * but now suddenly could establish a connection */
 525                 if (rv == SS_CW_FAILED_BY_PEER && mask.pdsk != 0) {
 526                         val.pdsk = 0;
 527                         mask.pdsk = 0;
 528                         continue;
 529                 }
 530
 531                 if (rv == SS_NO_UP_TO_DATE_DISK && force &&
 532                     (mdev->state.disk < D_UP_TO_DATE &&
 533                      mdev->state.disk >= D_INCONSISTENT)) {
 534                         mask.disk = D_MASK;
 535                         val.disk  = D_UP_TO_DATE;
 536                         forced = 1;
 537                         continue;
 538                 }
 539
 540                 if (rv == SS_NO_UP_TO_DATE_DISK &&
 541                     mdev->state.disk == D_CONSISTENT && mask.pdsk == 0) {
 542                         D_ASSERT(mdev->state.pdsk == D_UNKNOWN);
 543
 544                         if (conn_try_outdate_peer(mdev->tconn)) {
 545                                 val.disk = D_UP_TO_DATE;
 546                                 mask.disk = D_MASK;
 547                         }
 548                         continue;
 549                 }
 550
 551                 if (rv == SS_NOTHING_TO_DO)
 552                         goto out;
 553                 if (rv == SS_PRIMARY_NOP && mask.pdsk == 0) {
 554                         if (!conn_try_outdate_peer(mdev->tconn) && force) {
 555                                 dev_warn(DEV, "Forced into split brain situation!\n");
 556                                 mask.pdsk = D_MASK;
 557                                 val.pdsk  = D_OUTDATED;
 558
 559                         }
 560                         continue;
 561                 }
 562                 if (rv == SS_TWO_PRIMARIES) {
 563                         /* Maybe the peer is detected as dead very soon...
 564                            retry at most once more in this case. */
 565                         int timeo;
 566                         rcu_read_lock();
 567                         nc = rcu_dereference(mdev->tconn->net_conf);
 568                         timeo = nc ? (nc->ping_timeo + 1) * HZ / 10 : 1;
 569                         rcu_read_unlock();
 570                         schedule_timeout_interruptible(timeo);
 571                         if (try < max_tries)
 572                                 try = max_tries - 1;
 573                         continue;
 574                 }
 575                 if (rv < SS_SUCCESS) {
 576                         rv = _drbd_request_state(mdev, mask, val,
 577                                                 CS_VERBOSE + CS_WAIT_COMPLETE);
 578                         if (rv < SS_SUCCESS)
 579                                 goto out;
 580                 }
 581                 break;
 582         }
 583
 584         if (rv < SS_SUCCESS)
 585                 goto out;
 586
 587         if (forced)
 588                 dev_warn(DEV, "Forced to consider local data as UpToDate!\n");
 589
 590         /* Wait until nothing is on the fly :) */
 591         wait_event(mdev->misc_wait, atomic_read(&mdev->ap_pending_cnt) == 0);
 592
 593         if (new_role == R_SECONDARY) {
 594                 set_disk_ro(mdev->vdisk, true);
 595                 if (get_ldev(mdev)) {
 596                         mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
 597                         put_ldev(mdev);
 598                 }
 599         } else {
 600                 mutex_lock(&mdev->tconn->net_conf_update);
 601                 nc = mdev->tconn->net_conf;
 602                 if (nc)
 603                         nc->want_lose = 0; /* without copy; single bit op is atomic */
 604                 mutex_unlock(&mdev->tconn->net_conf_update);
 605
 606                 set_disk_ro(mdev->vdisk, false);
 607                 if (get_ldev(mdev)) {
 608                         if (((mdev->state.conn < C_CONNECTED ||
 609                                mdev->state.pdsk <= D_FAILED)
 610                               && mdev->ldev->md.uuid[UI_BITMAP] == 0) || forced)
 611                                 drbd_uuid_new_current(mdev);
 612
 613                         mdev->ldev->md.uuid[UI_CURRENT] |=  (u64)1;
 614                         put_ldev(mdev);
 615                 }
 616         }
 617
 618         /* writeout of activity log covered areas of the bitmap
 619          * to stable storage done in after state change already */
 620
 621         if (mdev->state.conn >= C_WF_REPORT_PARAMS) {
 622                 /* if this was forced, we should consider sync */
 623                 if (forced)
 624                         drbd_send_uuids(mdev);
 625                 drbd_send_state(mdev);
 626         }
 627
 628         drbd_md_sync(mdev);
 629
 630         kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
 631 out:
 632         mutex_unlock(mdev->state_mutex);
 633         return rv;
 634 }
 635
 636 static const char *from_attrs_err_to_txt(int err)
 637 {
 638         return  err == -ENOMSG ? "required attribute missing" :
 639                 err == -EOPNOTSUPP ? "unknown mandatory attribute" :
 640                 err == -EEXIST ? "can not change invariant setting" :
 641                 "invalid attribute value";
 642 }
 643
 644 int drbd_adm_set_role(struct sk_buff *skb, struct genl_info *info)
 645 {
 646         struct set_role_parms parms;
 647         int err;
 648         enum drbd_ret_code retcode;
 649
 650         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
 651         if (!adm_ctx.reply_skb)
 652                 return retcode;
 653         if (retcode != NO_ERROR)
 654                 goto out;
 655
 656         memset(&parms, 0, sizeof(parms));
 657         if (info->attrs[DRBD_NLA_SET_ROLE_PARMS]) {
 658                 err = set_role_parms_from_attrs(&parms, info);
 659                 if (err) {
 660                         retcode = ERR_MANDATORY_TAG;
 661                         drbd_msg_put_info(from_attrs_err_to_txt(err));
 662                         goto out;
 663                 }
 664         }
 665
 666         if (info->genlhdr->cmd == DRBD_ADM_PRIMARY)
 667                 retcode = drbd_set_role(adm_ctx.mdev, R_PRIMARY, parms.assume_uptodate);
 668         else
 669                 retcode = drbd_set_role(adm_ctx.mdev, R_SECONDARY, 0);
 670 out:
 671         drbd_adm_finish(info, retcode);
 672         return 0;
 673 }
 674
 675 /* initializes the md.*_offset members, so we are able to find
 676  * the on disk meta data */
 677 static void drbd_md_set_sector_offsets(struct drbd_conf *mdev,
 678                                        struct drbd_backing_dev *bdev)
 679 {
 680         sector_t md_size_sect = 0;
 681         switch (bdev->dc.meta_dev_idx) {
 682         default:
 683                 /* v07 style fixed size indexed meta data */
 684                 bdev->md.md_size_sect = MD_RESERVED_SECT;
 685                 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
 686                 bdev->md.al_offset = MD_AL_OFFSET;
 687                 bdev->md.bm_offset = MD_BM_OFFSET;
 688                 break;
 689         case DRBD_MD_INDEX_FLEX_EXT:
 690                 /* just occupy the full device; unit: sectors */
 691                 bdev->md.md_size_sect = drbd_get_capacity(bdev->md_bdev);
 692                 bdev->md.md_offset = 0;
 693                 bdev->md.al_offset = MD_AL_OFFSET;
 694                 bdev->md.bm_offset = MD_BM_OFFSET;
 695                 break;
 696         case DRBD_MD_INDEX_INTERNAL:
 697         case DRBD_MD_INDEX_FLEX_INT:
 698                 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
 699                 /* al size is still fixed */
 700                 bdev->md.al_offset = -MD_AL_SECTORS;
 701                 /* we need (slightly less than) ~ this much bitmap sectors: */
 702                 md_size_sect = drbd_get_capacity(bdev->backing_bdev);
 703                 md_size_sect = ALIGN(md_size_sect, BM_SECT_PER_EXT);
 704                 md_size_sect = BM_SECT_TO_EXT(md_size_sect);
 705                 md_size_sect = ALIGN(md_size_sect, 8);
 706
 707                 /* plus the "drbd meta data super block",
 708                  * and the activity log; */
 709                 md_size_sect += MD_BM_OFFSET;
 710
 711                 bdev->md.md_size_sect = md_size_sect;
 712                 /* bitmap offset is adjusted by 'super' block size */
 713                 bdev->md.bm_offset   = -md_size_sect + MD_AL_OFFSET;
 714                 break;
 715         }
 716 }
 717
 718 /* input size is expected to be in KB */
 719 char *ppsize(char *buf, unsigned long long size)
 720 {
 721         /* Needs 9 bytes at max including trailing NUL:
 722          * -1ULL ==> "16384 EB" */
 723         static char units[] = { 'K', 'M', 'G', 'T', 'P', 'E' };
 724         int base = 0;
 725         while (size >= 10000 && base < sizeof(units)-1) {
 726                 /* shift + round */
 727                 size = (size >> 10) + !!(size & (1<<9));
 728                 base++;
 729         }
 730         sprintf(buf, "%u %cB", (unsigned)size, units[base]);
 731
 732         return buf;
 733 }
 734
 735 /* there is still a theoretical deadlock when called from receiver
 736  * on an D_INCONSISTENT R_PRIMARY:
 737  *  remote READ does inc_ap_bio, receiver would need to receive answer
 738  *  packet from remote to dec_ap_bio again.
 739  *  receiver receive_sizes(), comes here,
 740  *  waits for ap_bio_cnt == 0. -> deadlock.
 741  * but this cannot happen, actually, because:
 742  *  R_PRIMARY D_INCONSISTENT, and peer's disk is unreachable
 743  *  (not connected, or bad/no disk on peer):
 744  *  see drbd_fail_request_early, ap_bio_cnt is zero.
 745  *  R_PRIMARY D_INCONSISTENT, and C_SYNC_TARGET:
 746  *  peer may not initiate a resize.
 747  */
 748 /* Note these are not to be confused with
 749  * drbd_adm_suspend_io/drbd_adm_resume_io,
 750  * which are (sub) state changes triggered by admin (drbdsetup),
 751  * and can be long lived.
 752  * This changes an mdev->flag, is triggered by drbd internals,
 753  * and should be short-lived. */
 754 void drbd_suspend_io(struct drbd_conf *mdev)
 755 {
 756         set_bit(SUSPEND_IO, &mdev->flags);
 757         if (drbd_suspended(mdev))
 758                 return;
 759         wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt));
 760 }
 761
 762 void drbd_resume_io(struct drbd_conf *mdev)
 763 {
 764         clear_bit(SUSPEND_IO, &mdev->flags);
 765         wake_up(&mdev->misc_wait);
 766 }
 767
 768 /**
 769  * drbd_determine_dev_size() -  Sets the right device size obeying all constraints
 770  * @mdev:       DRBD device.
 771  *
 772  * Returns 0 on success, negative return values indicate errors.
 773  * You should call drbd_md_sync() after calling this function.
 774  */
 775 enum determine_dev_size drbd_determine_dev_size(struct drbd_conf *mdev, enum dds_flags flags) __must_hold(local)
 776 {
 777         sector_t prev_first_sect, prev_size; /* previous meta location */
 778         sector_t la_size;
 779         sector_t size;
 780         char ppb[10];
 781
 782         int md_moved, la_size_changed;
 783         enum determine_dev_size rv = unchanged;
 784
 785         /* race:
 786          * application request passes inc_ap_bio,
 787          * but then cannot get an AL-reference.
 788          * this function later may wait on ap_bio_cnt == 0. -> deadlock.
 789          *
 790          * to avoid that:
 791          * Suspend IO right here.
 792          * still lock the act_log to not trigger ASSERTs there.
 793          */
 794         drbd_suspend_io(mdev);
 795
 796         /* no wait necessary anymore, actually we could assert that */
 797         wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
 798
 799         prev_first_sect = drbd_md_first_sector(mdev->ldev);
 800         prev_size = mdev->ldev->md.md_size_sect;
 801         la_size = mdev->ldev->md.la_size_sect;
 802
 803         /* TODO: should only be some assert here, not (re)init... */
 804         drbd_md_set_sector_offsets(mdev, mdev->ldev);
 805
 806         size = drbd_new_dev_size(mdev, mdev->ldev, flags & DDSF_FORCED);
 807
 808         if (drbd_get_capacity(mdev->this_bdev) != size ||
 809             drbd_bm_capacity(mdev) != size) {
 810                 int err;
 811                 err = drbd_bm_resize(mdev, size, !(flags & DDSF_NO_RESYNC));
 812                 if (unlikely(err)) {
 813                         /* currently there is only one error: ENOMEM! */
 814                         size = drbd_bm_capacity(mdev)>>1;
 815                         if (size == 0) {
 816                                 dev_err(DEV, "OUT OF MEMORY! "
 817                                     "Could not allocate bitmap!\n");
 818                         } else {
 819                                 dev_err(DEV, "BM resizing failed. "
 820                                     "Leaving size unchanged at size = %lu KB\n",
 821                                     (unsigned long)size);
 822                         }
 823                         rv = dev_size_error;
 824                 }
 825                 /* racy, see comments above. */
 826                 drbd_set_my_capacity(mdev, size);
 827                 mdev->ldev->md.la_size_sect = size;
 828                 dev_info(DEV, "size = %s (%llu KB)\n", ppsize(ppb, size>>1),
 829                      (unsigned long long)size>>1);
 830         }
 831         if (rv == dev_size_error)
 832                 goto out;
 833
 834         la_size_changed = (la_size != mdev->ldev->md.la_size_sect);
 835
 836         md_moved = prev_first_sect != drbd_md_first_sector(mdev->ldev)
 837                 || prev_size       != mdev->ldev->md.md_size_sect;
 838
 839         if (la_size_changed || md_moved) {
 840                 int err;
 841
 842                 drbd_al_shrink(mdev); /* All extents inactive. */
 843                 dev_info(DEV, "Writing the whole bitmap, %s\n",
 844                          la_size_changed && md_moved ? "size changed and md moved" :
 845                          la_size_changed ? "size changed" : "md moved");
 846                 /* next line implicitly does drbd_suspend_io()+drbd_resume_io() */
 847                 err = drbd_bitmap_io(mdev, &drbd_bm_write,
 848                                 "size changed", BM_LOCKED_MASK);
 849                 if (err) {
 850                         rv = dev_size_error;
 851                         goto out;
 852                 }
 853                 drbd_md_mark_dirty(mdev);
 854         }
 855
 856         if (size > la_size)
 857                 rv = grew;
 858         if (size < la_size)
 859                 rv = shrunk;
 860 out:
 861         lc_unlock(mdev->act_log);
 862         wake_up(&mdev->al_wait);
 863         drbd_resume_io(mdev);
 864
 865         return rv;
 866 }
 867
 868 sector_t
 869 drbd_new_dev_size(struct drbd_conf *mdev, struct drbd_backing_dev *bdev, int assume_peer_has_space)
 870 {
 871         sector_t p_size = mdev->p_size;   /* partner's disk size. */
 872         sector_t la_size = bdev->md.la_size_sect; /* last agreed size. */
 873         sector_t m_size; /* my size */
 874         sector_t u_size = bdev->dc.disk_size; /* size requested by user. */
 875         sector_t size = 0;
 876
 877         m_size = drbd_get_max_capacity(bdev);
 878
 879         if (mdev->state.conn < C_CONNECTED && assume_peer_has_space) {
 880                 dev_warn(DEV, "Resize while not connected was forced by the user!\n");
 881                 p_size = m_size;
 882         }
 883
 884         if (p_size && m_size) {
 885                 size = min_t(sector_t, p_size, m_size);
 886         } else {
 887                 if (la_size) {
 888                         size = la_size;
 889                         if (m_size && m_size < size)
 890                                 size = m_size;
 891                         if (p_size && p_size < size)
 892                                 size = p_size;
 893                 } else {
 894                         if (m_size)
 895                                 size = m_size;
 896                         if (p_size)
 897                                 size = p_size;
 898                 }
 899         }
 900
 901         if (size == 0)
 902                 dev_err(DEV, "Both nodes diskless!\n");
 903
 904         if (u_size) {
 905                 if (u_size > size)
 906                         dev_err(DEV, "Requested disk size is too big (%lu > %lu)\n",
 907                             (unsigned long)u_size>>1, (unsigned long)size>>1);
 908                 else
 909                         size = u_size;
 910         }
 911
 912         return size;
 913 }
 914
 915 /**
 916  * drbd_check_al_size() - Ensures that the AL is of the right size
 917  * @mdev:       DRBD device.
 918  *
 919  * Returns -EBUSY if current al lru is still used, -ENOMEM when allocation
 920  * failed, and 0 on success. You should call drbd_md_sync() after you called
 921  * this function.
 922  */
 923 static int drbd_check_al_size(struct drbd_conf *mdev, struct disk_conf *dc)
 924 {
 925         struct lru_cache *n, *t;
 926         struct lc_element *e;
 927         unsigned int in_use;
 928         int i;
 929
 930         if (!expect(dc->al_extents >= DRBD_AL_EXTENTS_MIN))
 931                 dc->al_extents = DRBD_AL_EXTENTS_MIN;
 932
 933         if (mdev->act_log &&
 934             mdev->act_log->nr_elements == dc->al_extents)
 935                 return 0;
 936
 937         in_use = 0;
 938         t = mdev->act_log;
 939         n = lc_create("act_log", drbd_al_ext_cache, AL_UPDATES_PER_TRANSACTION,
 940                 dc->al_extents, sizeof(struct lc_element), 0);
 941
 942         if (n == NULL) {
 943                 dev_err(DEV, "Cannot allocate act_log lru!\n");
 944                 return -ENOMEM;
 945         }
 946         spin_lock_irq(&mdev->al_lock);
 947         if (t) {
 948                 for (i = 0; i < t->nr_elements; i++) {
 949                         e = lc_element_by_index(t, i);
 950                         if (e->refcnt)
 951                                 dev_err(DEV, "refcnt(%d)==%d\n",
 952                                     e->lc_number, e->refcnt);
 953                         in_use += e->refcnt;
 954                 }
 955         }
 956         if (!in_use)
 957                 mdev->act_log = n;
 958         spin_unlock_irq(&mdev->al_lock);
 959         if (in_use) {
 960                 dev_err(DEV, "Activity log still in use!\n");
 961                 lc_destroy(n);
 962                 return -EBUSY;
 963         } else {
 964                 if (t)
 965                         lc_destroy(t);
 966         }
 967         drbd_md_mark_dirty(mdev); /* we changed mdev->act_log->nr_elemens */
 968         return 0;
 969 }
 970
 971 static void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_bio_size)
 972 {
 973         struct request_queue * const q = mdev->rq_queue;
 974         int max_hw_sectors = max_bio_size >> 9;
 975         int max_segments = 0;
 976
 977         if (get_ldev_if_state(mdev, D_ATTACHING)) {
 978                 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
 979
 980                 max_hw_sectors = min(queue_max_hw_sectors(b), max_bio_size >> 9);
 981                 max_segments = mdev->ldev->dc.max_bio_bvecs;
 982                 put_ldev(mdev);
 983         }
 984
 985         blk_queue_logical_block_size(q, 512);
 986         blk_queue_max_hw_sectors(q, max_hw_sectors);
 987         /* This is the workaround for "bio would need to, but cannot, be split" */
 988         blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS);
 989         blk_queue_segment_boundary(q, PAGE_CACHE_SIZE-1);
 990
 991         if (get_ldev_if_state(mdev, D_ATTACHING)) {
 992                 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
 993
 994                 blk_queue_stack_limits(q, b);
 995
 996                 if (q->backing_dev_info.ra_pages != b->backing_dev_info.ra_pages) {
 997                         dev_info(DEV, "Adjusting my ra_pages to backing device's (%lu -> %lu)\n",
 998                                  q->backing_dev_info.ra_pages,
 999                                  b->backing_dev_info.ra_pages);
1000                         q->backing_dev_info.ra_pages = b->backing_dev_info.ra_pages;
1001                 }
1002                 put_ldev(mdev);
1003         }
1004 }
1005
1006 void drbd_reconsider_max_bio_size(struct drbd_conf *mdev)
1007 {
1008         int now, new, local, peer;
1009
1010         now = queue_max_hw_sectors(mdev->rq_queue) << 9;
1011         local = mdev->local_max_bio_size; /* Eventually last known value, from volatile memory */
1012         peer = mdev->peer_max_bio_size; /* Eventually last known value, from meta data */
1013
1014         if (get_ldev_if_state(mdev, D_ATTACHING)) {
1015                 local = queue_max_hw_sectors(mdev->ldev->backing_bdev->bd_disk->queue) << 9;
1016                 mdev->local_max_bio_size = local;
1017                 put_ldev(mdev);
1018         }
1019
1020         /* We may ignore peer limits if the peer is modern enough.
1021            Because new from 8.3.8 onwards the peer can use multiple
1022            BIOs for a single peer_request */
1023         if (mdev->state.conn >= C_CONNECTED) {
1024                 if (mdev->tconn->agreed_pro_version < 94)
1025                         peer = mdev->peer_max_bio_size;
1026                 else if (mdev->tconn->agreed_pro_version == 94)
1027                         peer = DRBD_MAX_SIZE_H80_PACKET;
1028                 else /* drbd 8.3.8 onwards */
1029                         peer = DRBD_MAX_BIO_SIZE;
1030         }
1031
1032         new = min_t(int, local, peer);
1033
1034         if (mdev->state.role == R_PRIMARY && new < now)
1035                 dev_err(DEV, "ASSERT FAILED new < now; (%d < %d)\n", new, now);
1036
1037         if (new != now)
1038                 dev_info(DEV, "max BIO size = %u\n", new);
1039
1040         drbd_setup_queue_param(mdev, new);
1041 }
1042
1043 /* Starts the worker thread */
1044 static void conn_reconfig_start(struct drbd_tconn *tconn)
1045 {
1046         drbd_thread_start(&tconn->worker);
1047         conn_flush_workqueue(tconn);
1048 }
1049
1050 /* if still unconfigured, stops worker again. */
1051 static void conn_reconfig_done(struct drbd_tconn *tconn)
1052 {
1053         spin_lock_irq(&tconn->req_lock);
1054         if (conn_all_vols_unconf(tconn))
1055                 drbd_thread_stop_nowait(&tconn->worker);
1056         spin_unlock_irq(&tconn->req_lock);
1057 }
1058
1059 /* Make sure IO is suspended before calling this function(). */
1060 static void drbd_suspend_al(struct drbd_conf *mdev)
1061 {
1062         int s = 0;
1063
1064         if (!lc_try_lock(mdev->act_log)) {
1065                 dev_warn(DEV, "Failed to lock al in drbd_suspend_al()\n");
1066                 return;
1067         }
1068
1069         drbd_al_shrink(mdev);
1070         spin_lock_irq(&mdev->tconn->req_lock);
1071         if (mdev->state.conn < C_CONNECTED)
1072                 s = !test_and_set_bit(AL_SUSPENDED, &mdev->flags);
1073         spin_unlock_irq(&mdev->tconn->req_lock);
1074         lc_unlock(mdev->act_log);
1075
1076         if (s)
1077                 dev_info(DEV, "Suspended AL updates\n");
1078 }
1079
1080
1081 static bool should_set_defaults(struct genl_info *info)
1082 {
1083         unsigned flags = ((struct drbd_genlmsghdr*)info->userhdr)->flags;
1084         return 0 != (flags & DRBD_GENL_F_SET_DEFAULTS);
1085 }
1086
1087 /* Maybe we should we generate these functions
1088  * from the drbd_genl.h magic as well?
1089  * That way we would not "accidentally forget" to add defaults here. */
1090
1091 #define RESET_ARRAY_FIELD(field) do { \
1092         memset(field, 0, sizeof(field)); \
1093         field ## _len = 0; \
1094 } while (0)
1095 void drbd_set_res_opts_default(struct res_opts *r)
1096 {
1097         RESET_ARRAY_FIELD(r->cpu_mask);
1098         r->on_no_data  = DRBD_ON_NO_DATA_DEF;
1099 }
1100
1101 static void drbd_set_net_conf_defaults(struct net_conf *nc)
1102 {
1103         /* Do NOT (re)set those fields marked as GENLA_F_INVARIANT
1104          * in drbd_genl.h, they can only be change with disconnect/reconnect */
1105         RESET_ARRAY_FIELD(nc->shared_secret);
1106
1107         RESET_ARRAY_FIELD(nc->cram_hmac_alg);
1108         RESET_ARRAY_FIELD(nc->integrity_alg);
1109         RESET_ARRAY_FIELD(nc->verify_alg);
1110         RESET_ARRAY_FIELD(nc->csums_alg);
1111 #undef RESET_ARRAY_FIELD
1112
1113         nc->wire_protocol = DRBD_PROTOCOL_DEF;
1114         nc->try_connect_int = DRBD_CONNECT_INT_DEF;
1115         nc->timeout = DRBD_TIMEOUT_DEF;
1116         nc->ping_int = DRBD_PING_INT_DEF;
1117         nc->ping_timeo = DRBD_PING_TIMEO_DEF;
1118         nc->sndbuf_size = DRBD_SNDBUF_SIZE_DEF;
1119         nc->rcvbuf_size = DRBD_RCVBUF_SIZE_DEF;
1120         nc->ko_count = DRBD_KO_COUNT_DEF;
1121         nc->max_buffers = DRBD_MAX_BUFFERS_DEF;
1122         nc->max_epoch_size = DRBD_MAX_EPOCH_SIZE_DEF;
1123         nc->unplug_watermark = DRBD_UNPLUG_WATERMARK_DEF;
1124         nc->after_sb_0p = DRBD_AFTER_SB_0P_DEF;
1125         nc->after_sb_1p = DRBD_AFTER_SB_1P_DEF;
1126         nc->after_sb_2p = DRBD_AFTER_SB_2P_DEF;
1127         nc->rr_conflict = DRBD_RR_CONFLICT_DEF;
1128         nc->on_congestion = DRBD_ON_CONGESTION_DEF;
1129         nc->cong_fill = DRBD_CONG_FILL_DEF;
1130         nc->cong_extents = DRBD_CONG_EXTENTS_DEF;
1131         nc->two_primaries = 0;
1132         nc->no_cork = 0;
1133         nc->always_asbp = 0;
1134         nc->use_rle = 0;
1135 }
1136
1137 static void drbd_set_disk_conf_defaults(struct disk_conf *dc)
1138 {
1139         /* Do NOT (re)set those fields marked as GENLA_F_INVARIANT
1140          * in drbd_genl.h, they can only be change with detach/reattach */
1141         dc->on_io_error = DRBD_ON_IO_ERROR_DEF;
1142         dc->fencing = DRBD_FENCING_DEF;
1143         dc->resync_rate = DRBD_RATE_DEF;
1144         dc->resync_after = DRBD_AFTER_DEF;
1145         dc->al_extents = DRBD_AL_EXTENTS_DEF;
1146         dc->c_plan_ahead = DRBD_C_PLAN_AHEAD_DEF;
1147         dc->c_delay_target = DRBD_C_DELAY_TARGET_DEF;
1148         dc->c_fill_target = DRBD_C_FILL_TARGET_DEF;
1149         dc->c_max_rate = DRBD_C_MAX_RATE_DEF;
1150         dc->c_min_rate = DRBD_C_MIN_RATE_DEF;
1151         dc->no_disk_barrier = 0;
1152         dc->no_disk_flush = 0;
1153         dc->no_disk_drain = 0;
1154         dc->no_md_flush = 0;
1155 }
1156
1157
1158 int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info)
1159 {
1160         enum drbd_ret_code retcode;
1161         struct drbd_conf *mdev;
1162         struct disk_conf *new_disk_conf;
1163         int err, fifo_size;
1164         int *rs_plan_s = NULL;
1165
1166         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
1167         if (!adm_ctx.reply_skb)
1168                 return retcode;
1169         if (retcode != NO_ERROR)
1170                 goto out;
1171
1172         mdev = adm_ctx.mdev;
1173
1174         /* we also need a disk
1175          * to change the options on */
1176         if (!get_ldev(mdev)) {
1177                 retcode = ERR_NO_DISK;
1178                 goto out;
1179         }
1180
1181 /* FIXME freeze IO, cluster wide.
1182  *
1183  * We should make sure no-one uses
1184  * some half-updated struct when we
1185  * assign it later. */
1186
1187         new_disk_conf = kmalloc(sizeof(*new_disk_conf), GFP_KERNEL);
1188         if (!new_disk_conf) {
1189                 retcode = ERR_NOMEM;
1190                 goto fail;
1191         }
1192
1193         memcpy(new_disk_conf, &mdev->ldev->dc, sizeof(*new_disk_conf));
1194         if (should_set_defaults(info))
1195                 drbd_set_disk_conf_defaults(new_disk_conf);
1196
1197         err = disk_conf_from_attrs_for_change(new_disk_conf, info);
1198         if (err) {
1199                 retcode = ERR_MANDATORY_TAG;
1200                 drbd_msg_put_info(from_attrs_err_to_txt(err));
1201         }
1202
1203         if (!expect(new_disk_conf->resync_rate >= 1))
1204                 new_disk_conf->resync_rate = 1;
1205
1206         /* clip to allowed range */
1207         if (!expect(new_disk_conf->al_extents >= DRBD_AL_EXTENTS_MIN))
1208                 new_disk_conf->al_extents = DRBD_AL_EXTENTS_MIN;
1209         if (!expect(new_disk_conf->al_extents <= DRBD_AL_EXTENTS_MAX))
1210                 new_disk_conf->al_extents = DRBD_AL_EXTENTS_MAX;
1211
1212         /* most sanity checks done, try to assign the new sync-after
1213          * dependency.  need to hold the global lock in there,
1214          * to avoid a race in the dependency loop check. */
1215         retcode = drbd_alter_sa(mdev, new_disk_conf->resync_after);
1216         if (retcode != NO_ERROR)
1217                 goto fail;
1218
1219         fifo_size = (new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ;
1220         if (fifo_size != mdev->rs_plan_s.size && fifo_size > 0) {
1221                 rs_plan_s   = kzalloc(sizeof(int) * fifo_size, GFP_KERNEL);
1222                 if (!rs_plan_s) {
1223                         dev_err(DEV, "kmalloc of fifo_buffer failed");
1224                         retcode = ERR_NOMEM;
1225                         goto fail;
1226                 }
1227         }
1228
1229         if (fifo_size != mdev->rs_plan_s.size) {
1230                 kfree(mdev->rs_plan_s.values);
1231                 mdev->rs_plan_s.values = rs_plan_s;
1232                 mdev->rs_plan_s.size   = fifo_size;
1233                 mdev->rs_planed = 0;
1234                 rs_plan_s = NULL;
1235         }
1236
1237         wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
1238         drbd_al_shrink(mdev);
1239         err = drbd_check_al_size(mdev, new_disk_conf);
1240         lc_unlock(mdev->act_log);
1241         wake_up(&mdev->al_wait);
1242
1243         if (err) {
1244                 retcode = ERR_NOMEM;
1245                 goto fail;
1246         }
1247
1248         /* FIXME
1249          * To avoid someone looking at a half-updated struct, we probably
1250          * should have a rw-semaphor on net_conf and disk_conf.
1251          */
1252         mdev->ldev->dc = *new_disk_conf;
1253
1254         drbd_md_sync(mdev);
1255
1256
1257         if (mdev->state.conn >= C_CONNECTED)
1258                 drbd_send_sync_param(mdev);
1259
1260  fail:
1261         put_ldev(mdev);
1262         kfree(new_disk_conf);
1263         kfree(rs_plan_s);
1264  out:
1265         drbd_adm_finish(info, retcode);
1266         return 0;
1267 }
1268
1269 int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
1270 {
1271         struct drbd_conf *mdev;
1272         int err;
1273         enum drbd_ret_code retcode;
1274         enum determine_dev_size dd;
1275         sector_t max_possible_sectors;
1276         sector_t min_md_device_sectors;
1277         struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */
1278         struct block_device *bdev;
1279         struct lru_cache *resync_lru = NULL;
1280         union drbd_state ns, os;
1281         enum drbd_state_rv rv;
1282         struct net_conf *nc;
1283         int cp_discovered = 0;
1284
1285         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
1286         if (!adm_ctx.reply_skb)
1287                 return retcode;
1288         if (retcode != NO_ERROR)
1289                 goto finish;
1290
1291         mdev = adm_ctx.mdev;
1292         conn_reconfig_start(mdev->tconn);
1293
1294         /* if you want to reconfigure, please tear down first */
1295         if (mdev->state.disk > D_DISKLESS) {
1296                 retcode = ERR_DISK_CONFIGURED;
1297                 goto fail;
1298         }
1299         /* It may just now have detached because of IO error.  Make sure
1300          * drbd_ldev_destroy is done already, we may end up here very fast,
1301          * e.g. if someone calls attach from the on-io-error handler,
1302          * to realize a "hot spare" feature (not that I'd recommend that) */
1303         wait_event(mdev->misc_wait, !atomic_read(&mdev->local_cnt));
1304
1305         /* allocation not in the IO path, drbdsetup context */
1306         nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL);
1307         if (!nbc) {
1308                 retcode = ERR_NOMEM;
1309                 goto fail;
1310         }
1311
1312         drbd_set_disk_conf_defaults(&nbc->dc);
1313
1314         err = disk_conf_from_attrs(&nbc->dc, info);
1315         if (err) {
1316                 retcode = ERR_MANDATORY_TAG;
1317                 drbd_msg_put_info(from_attrs_err_to_txt(err));
1318                 goto fail;
1319         }
1320
1321         if ((int)nbc->dc.meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) {
1322                 retcode = ERR_MD_IDX_INVALID;
1323                 goto fail;
1324         }
1325
1326         rcu_read_lock();
1327         nc = rcu_dereference(mdev->tconn->net_conf);
1328         if (nc) {
1329                 if (nbc->dc.fencing == FP_STONITH && nc->wire_protocol == DRBD_PROT_A) {
1330                         rcu_read_unlock();
1331                         retcode = ERR_STONITH_AND_PROT_A;
1332                         goto fail;
1333                 }
1334         }
1335         rcu_read_unlock();
1336
1337         bdev = blkdev_get_by_path(nbc->dc.backing_dev,
1338                                   FMODE_READ | FMODE_WRITE | FMODE_EXCL, mdev);
1339         if (IS_ERR(bdev)) {
1340                 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.backing_dev,
1341                         PTR_ERR(bdev));
1342                 retcode = ERR_OPEN_DISK;
1343                 goto fail;
1344         }
1345         nbc->backing_bdev = bdev;
1346
1347         /*
1348          * meta_dev_idx >= 0: external fixed size, possibly multiple
1349          * drbd sharing one meta device.  TODO in that case, paranoia
1350          * check that [md_bdev, meta_dev_idx] is not yet used by some
1351          * other drbd minor!  (if you use drbd.conf + drbdadm, that
1352          * should check it for you already; but if you don't, or
1353          * someone fooled it, we need to double check here)
1354          */
1355         bdev = blkdev_get_by_path(nbc->dc.meta_dev,
1356                                   FMODE_READ | FMODE_WRITE | FMODE_EXCL,
1357                                   ((int)nbc->dc.meta_dev_idx < 0) ?
1358                                   (void *)mdev : (void *)drbd_m_holder);
1359         if (IS_ERR(bdev)) {
1360                 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.meta_dev,
1361                         PTR_ERR(bdev));
1362                 retcode = ERR_OPEN_MD_DISK;
1363                 goto fail;
1364         }
1365         nbc->md_bdev = bdev;
1366
1367         if ((nbc->backing_bdev == nbc->md_bdev) !=
1368             (nbc->dc.meta_dev_idx == DRBD_MD_INDEX_INTERNAL ||
1369              nbc->dc.meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) {
1370                 retcode = ERR_MD_IDX_INVALID;
1371                 goto fail;
1372         }
1373
1374         resync_lru = lc_create("resync", drbd_bm_ext_cache,
1375                         1, 61, sizeof(struct bm_extent),
1376                         offsetof(struct bm_extent, lce));
1377         if (!resync_lru) {
1378                 retcode = ERR_NOMEM;
1379                 goto fail;
1380         }
1381
1382         /* RT - for drbd_get_max_capacity() DRBD_MD_INDEX_FLEX_INT */
1383         drbd_md_set_sector_offsets(mdev, nbc);
1384
1385         if (drbd_get_max_capacity(nbc) < nbc->dc.disk_size) {
1386                 dev_err(DEV, "max capacity %llu smaller than disk size %llu\n",
1387                         (unsigned long long) drbd_get_max_capacity(nbc),
1388                         (unsigned long long) nbc->dc.disk_size);
1389                 retcode = ERR_DISK_TO_SMALL;
1390                 goto fail;
1391         }
1392
1393         if ((int)nbc->dc.meta_dev_idx < 0) {
1394                 max_possible_sectors = DRBD_MAX_SECTORS_FLEX;
1395                 /* at least one MB, otherwise it does not make sense */
1396                 min_md_device_sectors = (2<<10);
1397         } else {
1398                 max_possible_sectors = DRBD_MAX_SECTORS;
1399                 min_md_device_sectors = MD_RESERVED_SECT * (nbc->dc.meta_dev_idx + 1);
1400         }
1401
1402         if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) {
1403                 retcode = ERR_MD_DISK_TO_SMALL;
1404                 dev_warn(DEV, "refusing attach: md-device too small, "
1405                      "at least %llu sectors needed for this meta-disk type\n",
1406                      (unsigned long long) min_md_device_sectors);
1407                 goto fail;
1408         }
1409
1410         /* Make sure the new disk is big enough
1411          * (we may currently be R_PRIMARY with no local disk...) */
1412         if (drbd_get_max_capacity(nbc) <
1413             drbd_get_capacity(mdev->this_bdev)) {
1414                 retcode = ERR_DISK_TO_SMALL;
1415                 goto fail;
1416         }
1417
1418         nbc->known_size = drbd_get_capacity(nbc->backing_bdev);
1419
1420         if (nbc->known_size > max_possible_sectors) {
1421                 dev_warn(DEV, "==> truncating very big lower level device "
1422                         "to currently maximum possible %llu sectors <==\n",
1423                         (unsigned long long) max_possible_sectors);
1424                 if ((int)nbc->dc.meta_dev_idx >= 0)
1425                         dev_warn(DEV, "==>> using internal or flexible "
1426                                       "meta data may help <<==\n");
1427         }
1428
1429         drbd_suspend_io(mdev);
1430         /* also wait for the last barrier ack. */
1431         wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_pending_cnt) || drbd_suspended(mdev));
1432         /* and for any other previously queued work */
1433         drbd_flush_workqueue(mdev);
1434
1435         rv = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE);
1436         retcode = rv;  /* FIXME: Type mismatch. */
1437         drbd_resume_io(mdev);
1438         if (rv < SS_SUCCESS)
1439                 goto fail;
1440
1441         if (!get_ldev_if_state(mdev, D_ATTACHING))
1442                 goto force_diskless;
1443
1444         drbd_md_set_sector_offsets(mdev, nbc);
1445
1446         if (!mdev->bitmap) {
1447                 if (drbd_bm_init(mdev)) {
1448                         retcode = ERR_NOMEM;
1449                         goto force_diskless_dec;
1450                 }
1451         }
1452
1453         retcode = drbd_md_read(mdev, nbc);
1454         if (retcode != NO_ERROR)
1455                 goto force_diskless_dec;
1456
1457         if (mdev->state.conn < C_CONNECTED &&
1458             mdev->state.role == R_PRIMARY &&
1459             (mdev->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) {
1460                 dev_err(DEV, "Can only attach to data with current UUID=%016llX\n",
1461                     (unsigned long long)mdev->ed_uuid);
1462                 retcode = ERR_DATA_NOT_CURRENT;
1463                 goto force_diskless_dec;
1464         }
1465
1466         /* Since we are diskless, fix the activity log first... */
1467         if (drbd_check_al_size(mdev, &nbc->dc)) {
1468                 retcode = ERR_NOMEM;
1469                 goto force_diskless_dec;
1470         }
1471
1472         /* Prevent shrinking of consistent devices ! */
1473         if (drbd_md_test_flag(nbc, MDF_CONSISTENT) &&
1474             drbd_new_dev_size(mdev, nbc, 0) < nbc->md.la_size_sect) {
1475                 dev_warn(DEV, "refusing to truncate a consistent device\n");
1476                 retcode = ERR_DISK_TO_SMALL;
1477                 goto force_diskless_dec;
1478         }
1479
1480         if (!drbd_al_read_log(mdev, nbc)) {
1481                 retcode = ERR_IO_MD_DISK;
1482                 goto force_diskless_dec;
1483         }
1484
1485         /* Reset the "barriers don't work" bits here, then force meta data to
1486          * be written, to ensure we determine if barriers are supported. */
1487         if (nbc->dc.no_md_flush)
1488                 set_bit(MD_NO_FUA, &mdev->flags);
1489         else
1490                 clear_bit(MD_NO_FUA, &mdev->flags);
1491
1492         /* Point of no return reached.
1493          * Devices and memory are no longer released by error cleanup below.
1494          * now mdev takes over responsibility, and the state engine should
1495          * clean it up somewhere.  */
1496         D_ASSERT(mdev->ldev == NULL);
1497         mdev->ldev = nbc;
1498         mdev->resync = resync_lru;
1499         nbc = NULL;
1500         resync_lru = NULL;
1501
1502         mdev->write_ordering = WO_bdev_flush;
1503         drbd_bump_write_ordering(mdev, WO_bdev_flush);
1504
1505         if (drbd_md_test_flag(mdev->ldev, MDF_CRASHED_PRIMARY))
1506                 set_bit(CRASHED_PRIMARY, &mdev->flags);
1507         else
1508                 clear_bit(CRASHED_PRIMARY, &mdev->flags);
1509
1510         if (drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1511             !(mdev->state.role == R_PRIMARY && mdev->tconn->susp_nod)) {
1512                 set_bit(CRASHED_PRIMARY, &mdev->flags);
1513                 cp_discovered = 1;
1514         }
1515
1516         mdev->send_cnt = 0;
1517         mdev->recv_cnt = 0;
1518         mdev->read_cnt = 0;
1519         mdev->writ_cnt = 0;
1520
1521         drbd_reconsider_max_bio_size(mdev);
1522
1523         /* If I am currently not R_PRIMARY,
1524          * but meta data primary indicator is set,
1525          * I just now recover from a hard crash,
1526          * and have been R_PRIMARY before that crash.
1527          *
1528          * Now, if I had no connection before that crash
1529          * (have been degraded R_PRIMARY), chances are that
1530          * I won't find my peer now either.
1531          *
1532          * In that case, and _only_ in that case,
1533          * we use the degr-wfc-timeout instead of the default,
1534          * so we can automatically recover from a crash of a
1535          * degraded but active "cluster" after a certain timeout.
1536          */
1537         clear_bit(USE_DEGR_WFC_T, &mdev->flags);
1538         if (mdev->state.role != R_PRIMARY &&
1539              drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1540             !drbd_md_test_flag(mdev->ldev, MDF_CONNECTED_IND))
1541                 set_bit(USE_DEGR_WFC_T, &mdev->flags);
1542
1543         dd = drbd_determine_dev_size(mdev, 0);
1544         if (dd == dev_size_error) {
1545                 retcode = ERR_NOMEM_BITMAP;
1546                 goto force_diskless_dec;
1547         } else if (dd == grew)
1548                 set_bit(RESYNC_AFTER_NEG, &mdev->flags);
1549
1550         if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) {
1551                 dev_info(DEV, "Assuming that all blocks are out of sync "
1552                      "(aka FullSync)\n");
1553                 if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write,
1554                         "set_n_write from attaching", BM_LOCKED_MASK)) {
1555                         retcode = ERR_IO_MD_DISK;
1556                         goto force_diskless_dec;
1557                 }
1558         } else {
1559                 if (drbd_bitmap_io(mdev, &drbd_bm_read,
1560                         "read from attaching", BM_LOCKED_MASK)) {
1561                         retcode = ERR_IO_MD_DISK;
1562                         goto force_diskless_dec;
1563                 }
1564         }
1565
1566         if (cp_discovered) {
1567                 drbd_al_apply_to_bm(mdev);
1568                 if (drbd_bitmap_io(mdev, &drbd_bm_write,
1569                         "crashed primary apply AL", BM_LOCKED_MASK)) {
1570                         retcode = ERR_IO_MD_DISK;
1571                         goto force_diskless_dec;
1572                 }
1573         }
1574
1575         if (_drbd_bm_total_weight(mdev) == drbd_bm_bits(mdev))
1576                 drbd_suspend_al(mdev); /* IO is still suspended here... */
1577
1578         spin_lock_irq(&mdev->tconn->req_lock);
1579         os = drbd_read_state(mdev);
1580         ns = os;
1581         /* If MDF_CONSISTENT is not set go into inconsistent state,
1582            otherwise investigate MDF_WasUpToDate...
1583            If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state,
1584            otherwise into D_CONSISTENT state.
1585         */
1586         if (drbd_md_test_flag(mdev->ldev, MDF_CONSISTENT)) {
1587                 if (drbd_md_test_flag(mdev->ldev, MDF_WAS_UP_TO_DATE))
1588                         ns.disk = D_CONSISTENT;
1589                 else
1590                         ns.disk = D_OUTDATED;
1591         } else {
1592                 ns.disk = D_INCONSISTENT;
1593         }
1594
1595         if (drbd_md_test_flag(mdev->ldev, MDF_PEER_OUT_DATED))
1596                 ns.pdsk = D_OUTDATED;
1597
1598         if ( ns.disk == D_CONSISTENT &&
1599             (ns.pdsk == D_OUTDATED || mdev->ldev->dc.fencing == FP_DONT_CARE))
1600                 ns.disk = D_UP_TO_DATE;
1601
1602         /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND,
1603            MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before
1604            this point, because drbd_request_state() modifies these
1605            flags. */
1606
1607         /* In case we are C_CONNECTED postpone any decision on the new disk
1608            state after the negotiation phase. */
1609         if (mdev->state.conn == C_CONNECTED) {
1610                 mdev->new_state_tmp.i = ns.i;
1611                 ns.i = os.i;
1612                 ns.disk = D_NEGOTIATING;
1613
1614                 /* We expect to receive up-to-date UUIDs soon.
1615                    To avoid a race in receive_state, free p_uuid while
1616                    holding req_lock. I.e. atomic with the state change */
1617                 kfree(mdev->p_uuid);
1618                 mdev->p_uuid = NULL;
1619         }
1620
1621         rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
1622         spin_unlock_irq(&mdev->tconn->req_lock);
1623
1624         if (rv < SS_SUCCESS)
1625                 goto force_diskless_dec;
1626
1627         if (mdev->state.role == R_PRIMARY)
1628                 mdev->ldev->md.uuid[UI_CURRENT] |=  (u64)1;
1629         else
1630                 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
1631
1632         drbd_md_mark_dirty(mdev);
1633         drbd_md_sync(mdev);
1634
1635         kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1636         put_ldev(mdev);
1637         conn_reconfig_done(mdev->tconn);
1638         drbd_adm_finish(info, retcode);
1639         return 0;
1640
1641  force_diskless_dec:
1642         put_ldev(mdev);
1643  force_diskless:
1644         drbd_force_state(mdev, NS(disk, D_FAILED));
1645         drbd_md_sync(mdev);
1646  fail:
1647         conn_reconfig_done(mdev->tconn);
1648         if (nbc) {
1649                 if (nbc->backing_bdev)
1650                         blkdev_put(nbc->backing_bdev,
1651                                    FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1652                 if (nbc->md_bdev)
1653                         blkdev_put(nbc->md_bdev,
1654                                    FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1655                 kfree(nbc);
1656         }
1657         lc_destroy(resync_lru);
1658
1659  finish:
1660         drbd_adm_finish(info, retcode);
1661         return 0;
1662 }
1663
1664 static int adm_detach(struct drbd_conf *mdev)
1665 {
1666         enum drbd_state_rv retcode;
1667         drbd_suspend_io(mdev); /* so no-one is stuck in drbd_al_begin_io */
1668         retcode = drbd_request_state(mdev, NS(disk, D_DISKLESS));
1669         wait_event(mdev->misc_wait,
1670                         mdev->state.disk != D_DISKLESS ||
1671                         !atomic_read(&mdev->local_cnt));
1672         drbd_resume_io(mdev);
1673         return retcode;
1674 }
1675
1676 /* Detaching the disk is a process in multiple stages.  First we need to lock
1677  * out application IO, in-flight IO, IO stuck in drbd_al_begin_io.
1678  * Then we transition to D_DISKLESS, and wait for put_ldev() to return all
1679  * internal references as well.
1680  * Only then we have finally detached. */
1681 int drbd_adm_detach(struct sk_buff *skb, struct genl_info *info)
1682 {
1683         enum drbd_ret_code retcode;
1684
1685         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
1686         if (!adm_ctx.reply_skb)
1687                 return retcode;
1688         if (retcode != NO_ERROR)
1689                 goto out;
1690
1691         retcode = adm_detach(adm_ctx.mdev);
1692 out:
1693         drbd_adm_finish(info, retcode);
1694         return 0;
1695 }
1696
1697 static bool conn_resync_running(struct drbd_tconn *tconn)
1698 {
1699         struct drbd_conf *mdev;
1700         bool rv = false;
1701         int vnr;
1702
1703         rcu_read_lock();
1704         idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1705                 if (mdev->state.conn == C_SYNC_SOURCE ||
1706                     mdev->state.conn == C_SYNC_TARGET ||
1707                     mdev->state.conn == C_PAUSED_SYNC_S ||
1708                     mdev->state.conn == C_PAUSED_SYNC_T) {
1709                         rv = true;
1710                         break;
1711                 }
1712         }
1713         rcu_read_unlock();
1714
1715         return rv;
1716 }
1717
1718 static bool conn_ov_running(struct drbd_tconn *tconn)
1719 {
1720         struct drbd_conf *mdev;
1721         bool rv = false;
1722         int vnr;
1723
1724         rcu_read_lock();
1725         idr_for_each_entry(&tconn->volumes, mdev, vnr) {
1726                 if (mdev->state.conn == C_VERIFY_S ||
1727                     mdev->state.conn == C_VERIFY_T) {
1728                         rv = true;
1729                         break;
1730                 }
1731         }
1732         rcu_read_unlock();
1733
1734         return rv;
1735 }
1736
1737 static enum drbd_ret_code
1738 _check_net_options(struct drbd_tconn *tconn, struct net_conf *old_conf, struct net_conf *new_conf)
1739 {
1740         struct drbd_conf *mdev;
1741         int i;
1742
1743         if (old_conf && tconn->agreed_pro_version < 100 &&
1744             tconn->cstate == C_WF_REPORT_PARAMS &&
1745             new_conf->wire_protocol != old_conf->wire_protocol)
1746                 return ERR_NEED_APV_100;
1747
1748         if (new_conf->two_primaries &&
1749             (new_conf->wire_protocol != DRBD_PROT_C))
1750                 return ERR_NOT_PROTO_C;
1751
1752         idr_for_each_entry(&tconn->volumes, mdev, i) {
1753                 if (get_ldev(mdev)) {
1754                         enum drbd_fencing_p fp = mdev->ldev->dc.fencing;
1755                         put_ldev(mdev);
1756                         if (new_conf->wire_protocol == DRBD_PROT_A && fp == FP_STONITH)
1757                                 return ERR_STONITH_AND_PROT_A;
1758                 }
1759                 if (mdev->state.role == R_PRIMARY && new_conf->want_lose)
1760                         return ERR_DISCARD;
1761         }
1762
1763         if (new_conf->on_congestion != OC_BLOCK && new_conf->wire_protocol != DRBD_PROT_A)
1764                 return ERR_CONG_NOT_PROTO_A;
1765
1766         return NO_ERROR;
1767 }
1768
1769 static enum drbd_ret_code
1770 check_net_options(struct drbd_tconn *tconn, struct net_conf *new_conf)
1771 {
1772         static enum drbd_ret_code rv;
1773         struct drbd_conf *mdev;
1774         int i;
1775
1776         rcu_read_lock();
1777         rv = _check_net_options(tconn, rcu_dereference(tconn->net_conf), new_conf);
1778         rcu_read_unlock();
1779
1780         /* tconn->volumes protected by genl_lock() here */
1781         idr_for_each_entry(&tconn->volumes, mdev, i) {
1782                 if (!mdev->bitmap) {
1783                         if(drbd_bm_init(mdev))
1784                                 return ERR_NOMEM;
1785                 }
1786         }
1787
1788         return rv;
1789 }
1790
1791 struct crypto {
1792         struct crypto_hash *verify_tfm;
1793         struct crypto_hash *csums_tfm;
1794         struct crypto_hash *cram_hmac_tfm;
1795         struct crypto_hash *integrity_w_tfm;
1796         struct crypto_hash *integrity_r_tfm;
1797         void *int_dig_in;
1798         void *int_dig_vv;
1799 };
1800
1801 static int
1802 alloc_tfm(struct crypto_hash **tfm, char *tfm_name, int err_alg, int err_nd)
1803 {
1804         if (!tfm_name[0])
1805                 return NO_ERROR;
1806
1807         *tfm = crypto_alloc_hash(tfm_name, 0, CRYPTO_ALG_ASYNC);
1808         if (IS_ERR(*tfm)) {
1809                 *tfm = NULL;
1810                 return err_alg;
1811         }
1812
1813         if (!drbd_crypto_is_hash(crypto_hash_tfm(*tfm)))
1814                 return err_nd;
1815
1816         return NO_ERROR;
1817 }
1818
1819 static enum drbd_ret_code
1820 alloc_crypto(struct crypto *crypto, struct net_conf *new_conf)
1821 {
1822         char hmac_name[CRYPTO_MAX_ALG_NAME];
1823         enum drbd_ret_code rv;
1824         int hash_size;
1825
1826         rv = alloc_tfm(&crypto->csums_tfm, new_conf->csums_alg,
1827                        ERR_CSUMS_ALG, ERR_CSUMS_ALG_ND);
1828         if (rv != NO_ERROR)
1829                 return rv;
1830         rv = alloc_tfm(&crypto->verify_tfm, new_conf->verify_alg,
1831                        ERR_VERIFY_ALG, ERR_VERIFY_ALG_ND);
1832         if (rv != NO_ERROR)
1833                 return rv;
1834         rv = alloc_tfm(&crypto->integrity_w_tfm, new_conf->integrity_alg,
1835                        ERR_INTEGRITY_ALG, ERR_INTEGRITY_ALG_ND);
1836         if (rv != NO_ERROR)
1837                 return rv;
1838         rv = alloc_tfm(&crypto->integrity_r_tfm, new_conf->integrity_alg,
1839                        ERR_INTEGRITY_ALG, ERR_INTEGRITY_ALG_ND);
1840         if (rv != NO_ERROR)
1841                 return rv;
1842         if (new_conf->cram_hmac_alg[0] != 0) {
1843                 snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)",
1844                          new_conf->cram_hmac_alg);
1845
1846                 rv = alloc_tfm(&crypto->cram_hmac_tfm, hmac_name,
1847                                ERR_AUTH_ALG, ERR_AUTH_ALG_ND);
1848         }
1849         if (crypto->integrity_w_tfm) {
1850                 hash_size = crypto_hash_digestsize(crypto->integrity_w_tfm);
1851                 crypto->int_dig_in = kmalloc(hash_size, GFP_KERNEL);
1852                 if (!crypto->int_dig_in)
1853                         return ERR_NOMEM;
1854                 crypto->int_dig_vv = kmalloc(hash_size, GFP_KERNEL);
1855                 if (!crypto->int_dig_vv)
1856                         return ERR_NOMEM;
1857         }
1858
1859         return rv;
1860 }
1861
1862 static void free_crypto(struct crypto *crypto)
1863 {
1864         kfree(crypto->int_dig_in);
1865         kfree(crypto->int_dig_vv);
1866         crypto_free_hash(crypto->cram_hmac_tfm);
1867         crypto_free_hash(crypto->integrity_w_tfm);
1868         crypto_free_hash(crypto->integrity_r_tfm);
1869         crypto_free_hash(crypto->csums_tfm);
1870         crypto_free_hash(crypto->verify_tfm);
1871 }
1872
1873 int drbd_adm_net_opts(struct sk_buff *skb, struct genl_info *info)
1874 {
1875         enum drbd_ret_code retcode;
1876         struct drbd_tconn *tconn;
1877         struct net_conf *old_conf, *new_conf = NULL;
1878         int err;
1879         int ovr; /* online verify running */
1880         int rsr; /* re-sync running */
1881         struct crypto crypto = { };
1882
1883         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_CONN);
1884         if (!adm_ctx.reply_skb)
1885                 return retcode;
1886         if (retcode != NO_ERROR)
1887                 goto out;
1888
1889         tconn = adm_ctx.tconn;
1890
1891         new_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL);
1892         if (!new_conf) {
1893                 retcode = ERR_NOMEM;
1894                 goto out;
1895         }
1896
1897         conn_reconfig_start(tconn);
1898
1899         mutex_lock(&tconn->net_conf_update);
1900         old_conf = tconn->net_conf;
1901
1902         if (!old_conf) {
1903                 drbd_msg_put_info("net conf missing, try connect");
1904                 retcode = ERR_INVALID_REQUEST;
1905                 goto fail;
1906         }
1907
1908         *new_conf = *old_conf;
1909         if (should_set_defaults(info))
1910                 drbd_set_net_conf_defaults(new_conf);
1911
1912         err = net_conf_from_attrs_for_change(new_conf, info);
1913         if (err) {
1914                 retcode = ERR_MANDATORY_TAG;
1915                 drbd_msg_put_info(from_attrs_err_to_txt(err));
1916                 goto fail;
1917         }
1918
1919         retcode = check_net_options(tconn, new_conf);
1920         if (retcode != NO_ERROR)
1921                 goto fail;
1922
1923         /* re-sync running */
1924         rsr = conn_resync_running(tconn);
1925         if (rsr && strcmp(new_conf->csums_alg, old_conf->csums_alg)) {
1926                 retcode = ERR_CSUMS_RESYNC_RUNNING;
1927                 goto fail;
1928         }
1929
1930         /* online verify running */
1931         ovr = conn_ov_running(tconn);
1932         if (ovr && strcmp(new_conf->verify_alg, old_conf->verify_alg)) {
1933                 retcode = ERR_VERIFY_RUNNING;
1934                 goto fail;
1935         }
1936
1937         retcode = alloc_crypto(&crypto, new_conf);
1938         if (retcode != NO_ERROR)
1939                 goto fail;
1940
1941         rcu_assign_pointer(tconn->net_conf, new_conf);
1942
1943         if (!rsr) {
1944                 crypto_free_hash(tconn->csums_tfm);
1945                 tconn->csums_tfm = crypto.csums_tfm;
1946                 crypto.csums_tfm = NULL;
1947         }
1948         if (!ovr) {
1949                 crypto_free_hash(tconn->verify_tfm);
1950                 tconn->verify_tfm = crypto.verify_tfm;
1951                 crypto.verify_tfm = NULL;
1952         }
1953
1954         /* FIXME can not assign these so bluntly while we have ongoing IO */
1955         kfree(tconn->int_dig_in);
1956         tconn->int_dig_in = crypto.int_dig_in;
1957         kfree(tconn->int_dig_vv);
1958         tconn->int_dig_vv = crypto.int_dig_vv;
1959         crypto_free_hash(tconn->integrity_w_tfm);
1960         tconn->integrity_w_tfm = crypto.integrity_w_tfm;
1961         crypto_free_hash(tconn->integrity_r_tfm);
1962         tconn->integrity_r_tfm = crypto.integrity_r_tfm;
1963
1964         /* FIXME Changing cram_hmac while the connection is established is useless */
1965         crypto_free_hash(tconn->cram_hmac_tfm);
1966         tconn->cram_hmac_tfm = crypto.cram_hmac_tfm;
1967
1968         mutex_unlock(&tconn->net_conf_update);
1969         synchronize_rcu();
1970         kfree(old_conf);
1971
1972         if (tconn->cstate >= C_WF_REPORT_PARAMS)
1973                 drbd_send_sync_param(minor_to_mdev(conn_lowest_minor(tconn)));
1974
1975         goto done;
1976
1977  fail:
1978         mutex_unlock(&tconn->net_conf_update);
1979         free_crypto(&crypto);
1980         kfree(new_conf);
1981  done:
1982         conn_reconfig_done(tconn);
1983  out:
1984         drbd_adm_finish(info, retcode);
1985         return 0;
1986 }
1987
1988 int drbd_adm_connect(struct sk_buff *skb, struct genl_info *info)
1989 {
1990         struct drbd_conf *mdev;
1991         struct net_conf *old_conf, *new_conf = NULL;
1992         struct crypto crypto = { };
1993         struct drbd_tconn *oconn;
1994         struct drbd_tconn *tconn;
1995         struct sockaddr *new_my_addr, *new_peer_addr, *taken_addr;
1996         enum drbd_ret_code retcode;
1997         int i;
1998         int err;
1999
2000         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_CONN);
2001         if (!adm_ctx.reply_skb)
2002                 return retcode;
2003         if (retcode != NO_ERROR)
2004                 goto out;
2005
2006         tconn = adm_ctx.tconn;
2007         conn_reconfig_start(tconn);
2008
2009         if (tconn->cstate > C_STANDALONE) {
2010                 retcode = ERR_NET_CONFIGURED;
2011                 goto fail;
2012         }
2013
2014         /* allocation not in the IO path, cqueue thread context */
2015         new_conf = kzalloc(sizeof(*new_conf), GFP_KERNEL);
2016         if (!new_conf) {
2017                 retcode = ERR_NOMEM;
2018                 goto fail;
2019         }
2020
2021         drbd_set_net_conf_defaults(new_conf);
2022
2023         err = net_conf_from_attrs(new_conf, info);
2024         if (err) {
2025                 retcode = ERR_MANDATORY_TAG;
2026                 drbd_msg_put_info(from_attrs_err_to_txt(err));
2027                 goto fail;
2028         }
2029
2030         retcode = check_net_options(tconn, new_conf);
2031         if (retcode != NO_ERROR)
2032                 goto fail;
2033
2034         retcode = NO_ERROR;
2035
2036         new_my_addr = (struct sockaddr *)&new_conf->my_addr;
2037         new_peer_addr = (struct sockaddr *)&new_conf->peer_addr;
2038
2039         /* No need to take drbd_cfg_rwsem here.  All reconfiguration is
2040          * strictly serialized on genl_lock(). We are protected against
2041          * concurrent reconfiguration/addition/deletion */
2042         list_for_each_entry(oconn, &drbd_tconns, all_tconn) {
2043                 struct net_conf *nc;
2044                 if (oconn == tconn)
2045                         continue;
2046
2047                 rcu_read_lock();
2048                 nc = rcu_dereference(oconn->net_conf);
2049                 if (nc) {
2050                         taken_addr = (struct sockaddr *)&nc->my_addr;
2051                         if (new_conf->my_addr_len == nc->my_addr_len &&
2052                             !memcmp(new_my_addr, taken_addr, new_conf->my_addr_len))
2053                                 retcode = ERR_LOCAL_ADDR;
2054
2055                         taken_addr = (struct sockaddr *)&nc->peer_addr;
2056                         if (new_conf->peer_addr_len == nc->peer_addr_len &&
2057                             !memcmp(new_peer_addr, taken_addr, new_conf->peer_addr_len))
2058                                 retcode = ERR_PEER_ADDR;
2059                 }
2060                 rcu_read_unlock();
2061                 if (retcode != NO_ERROR)
2062                         goto fail;
2063         }
2064
2065         retcode = alloc_crypto(&crypto, new_conf);
2066         if (retcode != NO_ERROR)
2067                 goto fail;
2068
2069         ((char *)new_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0;
2070
2071         conn_flush_workqueue(tconn);
2072
2073         mutex_lock(&tconn->net_conf_update);
2074         old_conf = tconn->net_conf;
2075         if (old_conf) {
2076                 retcode = ERR_NET_CONFIGURED;
2077                 mutex_unlock(&tconn->net_conf_update);
2078                 goto fail;
2079         }
2080         rcu_assign_pointer(tconn->net_conf, new_conf);
2081
2082         conn_free_crypto(tconn);
2083         tconn->int_dig_in = crypto.int_dig_in;
2084         tconn->int_dig_vv = crypto.int_dig_vv;
2085         tconn->cram_hmac_tfm = crypto.cram_hmac_tfm;
2086         tconn->integrity_w_tfm = crypto.integrity_w_tfm;
2087         tconn->integrity_r_tfm = crypto.integrity_r_tfm;
2088         tconn->csums_tfm = crypto.csums_tfm;
2089         tconn->verify_tfm = crypto.verify_tfm;
2090
2091         mutex_unlock(&tconn->net_conf_update);
2092
2093         rcu_read_lock();
2094         idr_for_each_entry(&tconn->volumes, mdev, i) {
2095                 mdev->send_cnt = 0;
2096                 mdev->recv_cnt = 0;
2097         }
2098         rcu_read_unlock();
2099
2100         retcode = conn_request_state(tconn, NS(conn, C_UNCONNECTED), CS_VERBOSE);
2101
2102         conn_reconfig_done(tconn);
2103         drbd_adm_finish(info, retcode);
2104         return 0;
2105
2106 fail:
2107         free_crypto(&crypto);
2108         kfree(new_conf);
2109
2110         conn_reconfig_done(tconn);
2111 out:
2112         drbd_adm_finish(info, retcode);
2113         return 0;
2114 }
2115
2116 static enum drbd_state_rv conn_try_disconnect(struct drbd_tconn *tconn, bool force)
2117 {
2118         enum drbd_state_rv rv;
2119         if (force) {
2120                 spin_lock_irq(&tconn->req_lock);
2121                 rv = _conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD);
2122                 spin_unlock_irq(&tconn->req_lock);
2123                 return rv;
2124         }
2125
2126         rv = conn_request_state(tconn, NS(conn, C_DISCONNECTING), 0);
2127
2128         switch (rv) {
2129         case SS_NOTHING_TO_DO:
2130         case SS_ALREADY_STANDALONE:
2131                 return SS_SUCCESS;
2132         case SS_PRIMARY_NOP:
2133                 /* Our state checking code wants to see the peer outdated. */
2134                 rv = conn_request_state(tconn, NS2(conn, C_DISCONNECTING,
2135                                                         pdsk, D_OUTDATED), CS_VERBOSE);
2136                 break;
2137         case SS_CW_FAILED_BY_PEER:
2138                 /* The peer probably wants to see us outdated. */
2139                 rv = conn_request_state(tconn, NS2(conn, C_DISCONNECTING,
2140                                                         disk, D_OUTDATED), 0);
2141                 if (rv == SS_IS_DISKLESS || rv == SS_LOWER_THAN_OUTDATED) {
2142                         conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD);
2143                         rv = SS_SUCCESS;
2144                 }
2145                 break;
2146         default:;
2147                 /* no special handling necessary */
2148         }
2149
2150         return rv;
2151 }
2152
2153 int drbd_adm_disconnect(struct sk_buff *skb, struct genl_info *info)
2154 {
2155         struct disconnect_parms parms;
2156         struct drbd_tconn *tconn;
2157         enum drbd_state_rv rv;
2158         enum drbd_ret_code retcode;
2159         int err;
2160
2161         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_CONN);
2162         if (!adm_ctx.reply_skb)
2163                 return retcode;
2164         if (retcode != NO_ERROR)
2165                 goto fail;
2166
2167         tconn = adm_ctx.tconn;
2168         memset(&parms, 0, sizeof(parms));
2169         if (info->attrs[DRBD_NLA_DISCONNECT_PARMS]) {
2170                 err = disconnect_parms_from_attrs(&parms, info);
2171                 if (err) {
2172                         retcode = ERR_MANDATORY_TAG;
2173                         drbd_msg_put_info(from_attrs_err_to_txt(err));
2174                         goto fail;
2175                 }
2176         }
2177
2178         rv = conn_try_disconnect(tconn, parms.force_disconnect);
2179         if (rv < SS_SUCCESS)
2180                 goto fail;
2181
2182         /* No one else can reconfigure the network while I am here.
2183          * The state handling only uses drbd_thread_stop_nowait(),
2184          * we want to really wait here until the receiver is no more. */
2185         drbd_thread_stop(&tconn->receiver);
2186         if (wait_event_interruptible(tconn->ping_wait,
2187                                      tconn->cstate == C_STANDALONE)) {
2188                 retcode = ERR_INTR;
2189                 goto fail;
2190         }
2191
2192         retcode = NO_ERROR;
2193  fail:
2194         drbd_adm_finish(info, retcode);
2195         return 0;
2196 }
2197
2198 void resync_after_online_grow(struct drbd_conf *mdev)
2199 {
2200         int iass; /* I am sync source */
2201
2202         dev_info(DEV, "Resync of new storage after online grow\n");
2203         if (mdev->state.role != mdev->state.peer)
2204                 iass = (mdev->state.role == R_PRIMARY);
2205         else
2206                 iass = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags);
2207
2208         if (iass)
2209                 drbd_start_resync(mdev, C_SYNC_SOURCE);
2210         else
2211                 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE);
2212 }
2213
2214 int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info)
2215 {
2216         struct resize_parms rs;
2217         struct drbd_conf *mdev;
2218         enum drbd_ret_code retcode;
2219         enum determine_dev_size dd;
2220         enum dds_flags ddsf;
2221         int err;
2222
2223         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2224         if (!adm_ctx.reply_skb)
2225                 return retcode;
2226         if (retcode != NO_ERROR)
2227                 goto fail;
2228
2229         memset(&rs, 0, sizeof(struct resize_parms));
2230         if (info->attrs[DRBD_NLA_RESIZE_PARMS]) {
2231                 err = resize_parms_from_attrs(&rs, info);
2232                 if (err) {
2233                         retcode = ERR_MANDATORY_TAG;
2234                         drbd_msg_put_info(from_attrs_err_to_txt(err));
2235                         goto fail;
2236                 }
2237         }
2238
2239         mdev = adm_ctx.mdev;
2240         if (mdev->state.conn > C_CONNECTED) {
2241                 retcode = ERR_RESIZE_RESYNC;
2242                 goto fail;
2243         }
2244
2245         if (mdev->state.role == R_SECONDARY &&
2246             mdev->state.peer == R_SECONDARY) {
2247                 retcode = ERR_NO_PRIMARY;
2248                 goto fail;
2249         }
2250
2251         if (!get_ldev(mdev)) {
2252                 retcode = ERR_NO_DISK;
2253                 goto fail;
2254         }
2255
2256         if (rs.no_resync && mdev->tconn->agreed_pro_version < 93) {
2257                 retcode = ERR_NEED_APV_93;
2258                 goto fail;
2259         }
2260
2261         if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev))
2262                 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev);
2263
2264         mdev->ldev->dc.disk_size = (sector_t)rs.resize_size;
2265         ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0);
2266         dd = drbd_determine_dev_size(mdev, ddsf);
2267         drbd_md_sync(mdev);
2268         put_ldev(mdev);
2269         if (dd == dev_size_error) {
2270                 retcode = ERR_NOMEM_BITMAP;
2271                 goto fail;
2272         }
2273
2274         if (mdev->state.conn == C_CONNECTED) {
2275                 if (dd == grew)
2276                         set_bit(RESIZE_PENDING, &mdev->flags);
2277
2278                 drbd_send_uuids(mdev);
2279                 drbd_send_sizes(mdev, 1, ddsf);
2280         }
2281
2282  fail:
2283         drbd_adm_finish(info, retcode);
2284         return 0;
2285 }
2286
2287 int drbd_adm_resource_opts(struct sk_buff *skb, struct genl_info *info)
2288 {
2289         enum drbd_ret_code retcode;
2290         cpumask_var_t new_cpu_mask;
2291         struct drbd_tconn *tconn;
2292         int *rs_plan_s = NULL;
2293         struct res_opts sc;
2294         int err;
2295
2296         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_CONN);
2297         if (!adm_ctx.reply_skb)
2298                 return retcode;
2299         if (retcode != NO_ERROR)
2300                 goto fail;
2301         tconn = adm_ctx.tconn;
2302
2303         if (!zalloc_cpumask_var(&new_cpu_mask, GFP_KERNEL)) {
2304                 retcode = ERR_NOMEM;
2305                 drbd_msg_put_info("unable to allocate cpumask");
2306                 goto fail;
2307         }
2308
2309         sc = tconn->res_opts;
2310         if (should_set_defaults(info))
2311                 drbd_set_res_opts_default(&sc);
2312
2313         err = res_opts_from_attrs(&sc, info);
2314         if (err) {
2315                 retcode = ERR_MANDATORY_TAG;
2316                 drbd_msg_put_info(from_attrs_err_to_txt(err));
2317                 goto fail;
2318         }
2319
2320         /* silently ignore cpu mask on UP kernel */
2321         if (nr_cpu_ids > 1 && sc.cpu_mask[0] != 0) {
2322                 err = __bitmap_parse(sc.cpu_mask, 32, 0,
2323                                 cpumask_bits(new_cpu_mask), nr_cpu_ids);
2324                 if (err) {
2325                         conn_warn(tconn, "__bitmap_parse() failed with %d\n", err);
2326                         retcode = ERR_CPU_MASK_PARSE;
2327                         goto fail;
2328                 }
2329         }
2330
2331
2332         tconn->res_opts = sc;
2333
2334         if (!cpumask_equal(tconn->cpu_mask, new_cpu_mask)) {
2335                 cpumask_copy(tconn->cpu_mask, new_cpu_mask);
2336                 drbd_calc_cpu_mask(tconn);
2337                 tconn->receiver.reset_cpu_mask = 1;
2338                 tconn->asender.reset_cpu_mask = 1;
2339                 tconn->worker.reset_cpu_mask = 1;
2340         }
2341
2342 fail:
2343         kfree(rs_plan_s);
2344         free_cpumask_var(new_cpu_mask);
2345
2346         drbd_adm_finish(info, retcode);
2347         return 0;
2348 }
2349
2350 int drbd_adm_invalidate(struct sk_buff *skb, struct genl_info *info)
2351 {
2352         struct drbd_conf *mdev;
2353         int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
2354
2355         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2356         if (!adm_ctx.reply_skb)
2357                 return retcode;
2358         if (retcode != NO_ERROR)
2359                 goto out;
2360
2361         mdev = adm_ctx.mdev;
2362
2363         /* If there is still bitmap IO pending, probably because of a previous
2364          * resync just being finished, wait for it before requesting a new resync. */
2365         wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
2366
2367         retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED);
2368
2369         if (retcode < SS_SUCCESS && retcode != SS_NEED_CONNECTION)
2370                 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
2371
2372         while (retcode == SS_NEED_CONNECTION) {
2373                 spin_lock_irq(&mdev->tconn->req_lock);
2374                 if (mdev->state.conn < C_CONNECTED)
2375                         retcode = _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_VERBOSE, NULL);
2376                 spin_unlock_irq(&mdev->tconn->req_lock);
2377
2378                 if (retcode != SS_NEED_CONNECTION)
2379                         break;
2380
2381                 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
2382         }
2383
2384 out:
2385         drbd_adm_finish(info, retcode);
2386         return 0;
2387 }
2388
2389 static int drbd_bmio_set_susp_al(struct drbd_conf *mdev)
2390 {
2391         int rv;
2392
2393         rv = drbd_bmio_set_n_write(mdev);
2394         drbd_suspend_al(mdev);
2395         return rv;
2396 }
2397
2398 static int drbd_adm_simple_request_state(struct sk_buff *skb, struct genl_info *info,
2399                 union drbd_state mask, union drbd_state val)
2400 {
2401         enum drbd_ret_code retcode;
2402
2403         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2404         if (!adm_ctx.reply_skb)
2405                 return retcode;
2406         if (retcode != NO_ERROR)
2407                 goto out;
2408
2409         retcode = drbd_request_state(adm_ctx.mdev, mask, val);
2410 out:
2411         drbd_adm_finish(info, retcode);
2412         return 0;
2413 }
2414
2415 int drbd_adm_invalidate_peer(struct sk_buff *skb, struct genl_info *info)
2416 {
2417         return drbd_adm_simple_request_state(skb, info, NS(conn, C_STARTING_SYNC_S));
2418 }
2419
2420 int drbd_adm_pause_sync(struct sk_buff *skb, struct genl_info *info)
2421 {
2422         enum drbd_ret_code retcode;
2423
2424         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2425         if (!adm_ctx.reply_skb)
2426                 return retcode;
2427         if (retcode != NO_ERROR)
2428                 goto out;
2429
2430         if (drbd_request_state(adm_ctx.mdev, NS(user_isp, 1)) == SS_NOTHING_TO_DO)
2431                 retcode = ERR_PAUSE_IS_SET;
2432 out:
2433         drbd_adm_finish(info, retcode);
2434         return 0;
2435 }
2436
2437 int drbd_adm_resume_sync(struct sk_buff *skb, struct genl_info *info)
2438 {
2439         union drbd_dev_state s;
2440         enum drbd_ret_code retcode;
2441
2442         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2443         if (!adm_ctx.reply_skb)
2444                 return retcode;
2445         if (retcode != NO_ERROR)
2446                 goto out;
2447
2448         if (drbd_request_state(adm_ctx.mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO) {
2449                 s = adm_ctx.mdev->state;
2450                 if (s.conn == C_PAUSED_SYNC_S || s.conn == C_PAUSED_SYNC_T) {
2451                         retcode = s.aftr_isp ? ERR_PIC_AFTER_DEP :
2452                                   s.peer_isp ? ERR_PIC_PEER_DEP : ERR_PAUSE_IS_CLEAR;
2453                 } else {
2454                         retcode = ERR_PAUSE_IS_CLEAR;
2455                 }
2456         }
2457
2458 out:
2459         drbd_adm_finish(info, retcode);
2460         return 0;
2461 }
2462
2463 int drbd_adm_suspend_io(struct sk_buff *skb, struct genl_info *info)
2464 {
2465         return drbd_adm_simple_request_state(skb, info, NS(susp, 1));
2466 }
2467
2468 int drbd_adm_resume_io(struct sk_buff *skb, struct genl_info *info)
2469 {
2470         struct drbd_conf *mdev;
2471         int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
2472
2473         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2474         if (!adm_ctx.reply_skb)
2475                 return retcode;
2476         if (retcode != NO_ERROR)
2477                 goto out;
2478
2479         mdev = adm_ctx.mdev;
2480         if (test_bit(NEW_CUR_UUID, &mdev->flags)) {
2481                 drbd_uuid_new_current(mdev);
2482                 clear_bit(NEW_CUR_UUID, &mdev->flags);
2483         }
2484         drbd_suspend_io(mdev);
2485         retcode = drbd_request_state(mdev, NS3(susp, 0, susp_nod, 0, susp_fen, 0));
2486         if (retcode == SS_SUCCESS) {
2487                 if (mdev->state.conn < C_CONNECTED)
2488                         tl_clear(mdev->tconn);
2489                 if (mdev->state.disk == D_DISKLESS || mdev->state.disk == D_FAILED)
2490                         tl_restart(mdev->tconn, FAIL_FROZEN_DISK_IO);
2491         }
2492         drbd_resume_io(mdev);
2493
2494 out:
2495         drbd_adm_finish(info, retcode);
2496         return 0;
2497 }
2498
2499 int drbd_adm_outdate(struct sk_buff *skb, struct genl_info *info)
2500 {
2501         return drbd_adm_simple_request_state(skb, info, NS(disk, D_OUTDATED));
2502 }
2503
2504 int nla_put_drbd_cfg_context(struct sk_buff *skb, const char *conn_name, unsigned vnr)
2505 {
2506         struct nlattr *nla;
2507         nla = nla_nest_start(skb, DRBD_NLA_CFG_CONTEXT);
2508         if (!nla)
2509                 goto nla_put_failure;
2510         if (vnr != VOLUME_UNSPECIFIED)
2511                 NLA_PUT_U32(skb, T_ctx_volume, vnr);
2512         NLA_PUT_STRING(skb, T_ctx_conn_name, conn_name);
2513         nla_nest_end(skb, nla);
2514         return 0;
2515
2516 nla_put_failure:
2517         if (nla)
2518                 nla_nest_cancel(skb, nla);
2519         return -EMSGSIZE;
2520 }
2521
2522 int nla_put_status_info(struct sk_buff *skb, struct drbd_conf *mdev,
2523                 const struct sib_info *sib)
2524 {
2525         struct state_info *si = NULL; /* for sizeof(si->member); */
2526         struct net_conf *nc;
2527         struct nlattr *nla;
2528         int got_ldev;
2529         int err = 0;
2530         int exclude_sensitive;
2531
2532         /* If sib != NULL, this is drbd_bcast_event, which anyone can listen
2533          * to.  So we better exclude_sensitive information.
2534          *
2535          * If sib == NULL, this is drbd_adm_get_status, executed synchronously
2536          * in the context of the requesting user process. Exclude sensitive
2537          * information, unless current has superuser.
2538          *
2539          * NOTE: for drbd_adm_get_status_all(), this is a netlink dump, and
2540          * relies on the current implementation of netlink_dump(), which
2541          * executes the dump callback successively from netlink_recvmsg(),
2542          * always in the context of the receiving process */
2543         exclude_sensitive = sib || !capable(CAP_SYS_ADMIN);
2544
2545         got_ldev = get_ldev(mdev);
2546
2547         /* We need to add connection name and volume number information still.
2548          * Minor number is in drbd_genlmsghdr. */
2549         if (nla_put_drbd_cfg_context(skb, mdev->tconn->name, mdev->vnr))
2550                 goto nla_put_failure;
2551
2552         if (res_opts_to_skb(skb, &mdev->tconn->res_opts, exclude_sensitive))
2553                 goto nla_put_failure;
2554
2555         if (got_ldev)
2556                 if (disk_conf_to_skb(skb, &mdev->ldev->dc, exclude_sensitive))
2557                         goto nla_put_failure;
2558
2559         rcu_read_lock();
2560         nc = rcu_dereference(mdev->tconn->net_conf);
2561         if (nc)
2562                 err = net_conf_to_skb(skb, nc, exclude_sensitive);
2563         rcu_read_unlock();
2564         if (err)
2565                 goto nla_put_failure;
2566
2567         nla = nla_nest_start(skb, DRBD_NLA_STATE_INFO);
2568         if (!nla)
2569                 goto nla_put_failure;
2570         NLA_PUT_U32(skb, T_sib_reason, sib ? sib->sib_reason : SIB_GET_STATUS_REPLY);
2571         NLA_PUT_U32(skb, T_current_state, mdev->state.i);
2572         NLA_PUT_U64(skb, T_ed_uuid, mdev->ed_uuid);
2573         NLA_PUT_U64(skb, T_capacity, drbd_get_capacity(mdev->this_bdev));
2574
2575         if (got_ldev) {
2576                 NLA_PUT_U32(skb, T_disk_flags, mdev->ldev->md.flags);
2577                 NLA_PUT(skb, T_uuids, sizeof(si->uuids), mdev->ldev->md.uuid);
2578                 NLA_PUT_U64(skb, T_bits_total, drbd_bm_bits(mdev));
2579                 NLA_PUT_U64(skb, T_bits_oos, drbd_bm_total_weight(mdev));
2580                 if (C_SYNC_SOURCE <= mdev->state.conn &&
2581                     C_PAUSED_SYNC_T >= mdev->state.conn) {
2582                         NLA_PUT_U64(skb, T_bits_rs_total, mdev->rs_total);
2583                         NLA_PUT_U64(skb, T_bits_rs_failed, mdev->rs_failed);
2584                 }
2585         }
2586
2587         if (sib) {
2588                 switch(sib->sib_reason) {
2589                 case SIB_SYNC_PROGRESS:
2590                 case SIB_GET_STATUS_REPLY:
2591                         break;
2592                 case SIB_STATE_CHANGE:
2593                         NLA_PUT_U32(skb, T_prev_state, sib->os.i);
2594                         NLA_PUT_U32(skb, T_new_state, sib->ns.i);
2595                         break;
2596                 case SIB_HELPER_POST:
2597                         NLA_PUT_U32(skb,
2598                                 T_helper_exit_code, sib->helper_exit_code);
2599                         /* fall through */
2600                 case SIB_HELPER_PRE:
2601                         NLA_PUT_STRING(skb, T_helper, sib->helper_name);
2602                         break;
2603                 }
2604         }
2605         nla_nest_end(skb, nla);
2606
2607         if (0)
2608 nla_put_failure:
2609                 err = -EMSGSIZE;
2610         if (got_ldev)
2611                 put_ldev(mdev);
2612         return err;
2613 }
2614
2615 int drbd_adm_get_status(struct sk_buff *skb, struct genl_info *info)
2616 {
2617         enum drbd_ret_code retcode;
2618         int err;
2619
2620         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2621         if (!adm_ctx.reply_skb)
2622                 return retcode;
2623         if (retcode != NO_ERROR)
2624                 goto out;
2625
2626         err = nla_put_status_info(adm_ctx.reply_skb, adm_ctx.mdev, NULL);
2627         if (err) {
2628                 nlmsg_free(adm_ctx.reply_skb);
2629                 return err;
2630         }
2631 out:
2632         drbd_adm_finish(info, retcode);
2633         return 0;
2634 }
2635
2636 int get_one_status(struct sk_buff *skb, struct netlink_callback *cb)
2637 {
2638         struct drbd_conf *mdev;
2639         struct drbd_genlmsghdr *dh;
2640         struct drbd_tconn *pos = (struct drbd_tconn*)cb->args[0];
2641         struct drbd_tconn *tconn = NULL;
2642         struct drbd_tconn *tmp;
2643         unsigned volume = cb->args[1];
2644
2645         /* Open coded, deferred, iteration:
2646          * list_for_each_entry_safe(tconn, tmp, &drbd_tconns, all_tconn) {
2647          *      idr_for_each_entry(&tconn->volumes, mdev, i) {
2648          *        ...
2649          *      }
2650          * }
2651          * where tconn is cb->args[0];
2652          * and i is cb->args[1];
2653          *
2654          * cb->args[2] indicates if we shall loop over all resources,
2655          * or just dump all volumes of a single resource.
2656          *
2657          * This may miss entries inserted after this dump started,
2658          * or entries deleted before they are reached.
2659          *
2660          * We need to make sure the mdev won't disappear while
2661          * we are looking at it, and revalidate our iterators
2662          * on each iteration.
2663          */
2664
2665         /* synchronize with conn_create()/conn_destroy() */
2666         down_read(&drbd_cfg_rwsem);
2667         /* revalidate iterator position */
2668         list_for_each_entry(tmp, &drbd_tconns, all_tconn) {
2669                 if (pos == NULL) {
2670                         /* first iteration */
2671                         pos = tmp;
2672                         tconn = pos;
2673                         break;
2674                 }
2675                 if (tmp == pos) {
2676                         tconn = pos;
2677                         break;
2678                 }
2679         }
2680         if (tconn) {
2681 next_tconn:
2682                 mdev = idr_get_next(&tconn->volumes, &volume);
2683                 if (!mdev) {
2684                         /* No more volumes to dump on this tconn.
2685                          * Advance tconn iterator. */
2686                         pos = list_entry(tconn->all_tconn.next,
2687                                         struct drbd_tconn, all_tconn);
2688                         /* Did we dump any volume on this tconn yet? */
2689                         if (volume != 0) {
2690                                 /* If we reached the end of the list,
2691                                  * or only a single resource dump was requested,
2692                                  * we are done. */
2693                                 if (&pos->all_tconn == &drbd_tconns || cb->args[2])
2694                                         goto out;
2695                                 volume = 0;
2696                                 tconn = pos;
2697                                 goto next_tconn;
2698                         }
2699                 }
2700
2701                 dh = genlmsg_put(skb, NETLINK_CB(cb->skb).pid,
2702                                 cb->nlh->nlmsg_seq, &drbd_genl_family,
2703                                 NLM_F_MULTI, DRBD_ADM_GET_STATUS);
2704                 if (!dh)
2705                         goto out;
2706
2707                 if (!mdev) {
2708                         /* this is a tconn without a single volume */
2709                         dh->minor = -1U;
2710                         dh->ret_code = NO_ERROR;
2711                         if (nla_put_drbd_cfg_context(skb, tconn->name, VOLUME_UNSPECIFIED))
2712                                 genlmsg_cancel(skb, dh);
2713                         else
2714                                 genlmsg_end(skb, dh);
2715                         goto out;
2716                 }
2717
2718                 D_ASSERT(mdev->vnr == volume);
2719                 D_ASSERT(mdev->tconn == tconn);
2720
2721                 dh->minor = mdev_to_minor(mdev);
2722                 dh->ret_code = NO_ERROR;
2723
2724                 if (nla_put_status_info(skb, mdev, NULL)) {
2725                         genlmsg_cancel(skb, dh);
2726                         goto out;
2727                 }
2728                 genlmsg_end(skb, dh);
2729         }
2730
2731 out:
2732         up_read(&drbd_cfg_rwsem);
2733         /* where to start the next iteration */
2734         cb->args[0] = (long)pos;
2735         cb->args[1] = (pos == tconn) ? volume + 1 : 0;
2736
2737         /* No more tconns/volumes/minors found results in an empty skb.
2738          * Which will terminate the dump. */
2739         return skb->len;
2740 }
2741
2742 /*
2743  * Request status of all resources, or of all volumes within a single resource.
2744  *
2745  * This is a dump, as the answer may not fit in a single reply skb otherwise.
2746  * Which means we cannot use the family->attrbuf or other such members, because
2747  * dump is NOT protected by the genl_lock().  During dump, we only have access
2748  * to the incoming skb, and need to opencode "parsing" of the nlattr payload.
2749  *
2750  * Once things are setup properly, we call into get_one_status().
2751  */
2752 int drbd_adm_get_status_all(struct sk_buff *skb, struct netlink_callback *cb)
2753 {
2754         const unsigned hdrlen = GENL_HDRLEN + GENL_MAGIC_FAMILY_HDRSZ;
2755         struct nlattr *nla;
2756         const char *conn_name;
2757         struct drbd_tconn *tconn;
2758
2759         /* Is this a followup call? */
2760         if (cb->args[0]) {
2761                 /* ... of a single resource dump,
2762                  * and the resource iterator has been advanced already? */
2763                 if (cb->args[2] && cb->args[2] != cb->args[0])
2764                         return 0; /* DONE. */
2765                 goto dump;
2766         }
2767
2768         /* First call (from netlink_dump_start).  We need to figure out
2769          * which resource(s) the user wants us to dump. */
2770         nla = nla_find(nlmsg_attrdata(cb->nlh, hdrlen),
2771                         nlmsg_attrlen(cb->nlh, hdrlen),
2772                         DRBD_NLA_CFG_CONTEXT);
2773
2774         /* No explicit context given.  Dump all. */
2775         if (!nla)
2776                 goto dump;
2777         nla = nla_find_nested(nla, __nla_type(T_ctx_conn_name));
2778         /* context given, but no name present? */
2779         if (!nla)
2780                 return -EINVAL;
2781         conn_name = nla_data(nla);
2782         tconn = conn_get_by_name(conn_name);
2783
2784         if (!tconn)
2785                 return -ENODEV;
2786
2787         kref_put(&tconn->kref, &conn_destroy); /* get_one_status() (re)validates tconn by itself */
2788
2789         /* prime iterators, and set "filter" mode mark:
2790          * only dump this tconn. */
2791         cb->args[0] = (long)tconn;
2792         /* cb->args[1] = 0; passed in this way. */
2793         cb->args[2] = (long)tconn;
2794
2795 dump:
2796         return get_one_status(skb, cb);
2797 }
2798
2799 int drbd_adm_get_timeout_type(struct sk_buff *skb, struct genl_info *info)
2800 {
2801         enum drbd_ret_code retcode;
2802         struct timeout_parms tp;
2803         int err;
2804
2805         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2806         if (!adm_ctx.reply_skb)
2807                 return retcode;
2808         if (retcode != NO_ERROR)
2809                 goto out;
2810
2811         tp.timeout_type =
2812                 adm_ctx.mdev->state.pdsk == D_OUTDATED ? UT_PEER_OUTDATED :
2813                 test_bit(USE_DEGR_WFC_T, &adm_ctx.mdev->flags) ? UT_DEGRADED :
2814                 UT_DEFAULT;
2815
2816         err = timeout_parms_to_priv_skb(adm_ctx.reply_skb, &tp);
2817         if (err) {
2818                 nlmsg_free(adm_ctx.reply_skb);
2819                 return err;
2820         }
2821 out:
2822         drbd_adm_finish(info, retcode);
2823         return 0;
2824 }
2825
2826 int drbd_adm_start_ov(struct sk_buff *skb, struct genl_info *info)
2827 {
2828         struct drbd_conf *mdev;
2829         enum drbd_ret_code retcode;
2830
2831         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2832         if (!adm_ctx.reply_skb)
2833                 return retcode;
2834         if (retcode != NO_ERROR)
2835                 goto out;
2836
2837         mdev = adm_ctx.mdev;
2838         if (info->attrs[DRBD_NLA_START_OV_PARMS]) {
2839                 /* resume from last known position, if possible */
2840                 struct start_ov_parms parms =
2841                         { .ov_start_sector = mdev->ov_start_sector };
2842                 int err = start_ov_parms_from_attrs(&parms, info);
2843                 if (err) {
2844                         retcode = ERR_MANDATORY_TAG;
2845                         drbd_msg_put_info(from_attrs_err_to_txt(err));
2846                         goto out;
2847                 }
2848                 /* w_make_ov_request expects position to be aligned */
2849                 mdev->ov_start_sector = parms.ov_start_sector & ~BM_SECT_PER_BIT;
2850         }
2851         /* If there is still bitmap IO pending, e.g. previous resync or verify
2852          * just being finished, wait for it before requesting a new resync. */
2853         wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
2854         retcode = drbd_request_state(mdev,NS(conn,C_VERIFY_S));
2855 out:
2856         drbd_adm_finish(info, retcode);
2857         return 0;
2858 }
2859
2860
2861 int drbd_adm_new_c_uuid(struct sk_buff *skb, struct genl_info *info)
2862 {
2863         struct drbd_conf *mdev;
2864         enum drbd_ret_code retcode;
2865         int skip_initial_sync = 0;
2866         int err;
2867         struct new_c_uuid_parms args;
2868
2869         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
2870         if (!adm_ctx.reply_skb)
2871                 return retcode;
2872         if (retcode != NO_ERROR)
2873                 goto out_nolock;
2874
2875         mdev = adm_ctx.mdev;
2876         memset(&args, 0, sizeof(args));
2877         if (info->attrs[DRBD_NLA_NEW_C_UUID_PARMS]) {
2878                 err = new_c_uuid_parms_from_attrs(&args, info);
2879                 if (err) {
2880                         retcode = ERR_MANDATORY_TAG;
2881                         drbd_msg_put_info(from_attrs_err_to_txt(err));
2882                         goto out_nolock;
2883                 }
2884         }
2885
2886         mutex_lock(mdev->state_mutex); /* Protects us against serialized state changes. */
2887
2888         if (!get_ldev(mdev)) {
2889                 retcode = ERR_NO_DISK;
2890                 goto out;
2891         }
2892
2893         /* this is "skip initial sync", assume to be clean */
2894         if (mdev->state.conn == C_CONNECTED && mdev->tconn->agreed_pro_version >= 90 &&
2895             mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) {
2896                 dev_info(DEV, "Preparing to skip initial sync\n");
2897                 skip_initial_sync = 1;
2898         } else if (mdev->state.conn != C_STANDALONE) {
2899                 retcode = ERR_CONNECTED;
2900                 goto out_dec;
2901         }
2902
2903         drbd_uuid_set(mdev, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */
2904         drbd_uuid_new_current(mdev); /* New current, previous to UI_BITMAP */
2905
2906         if (args.clear_bm) {
2907                 err = drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write,
2908                         "clear_n_write from new_c_uuid", BM_LOCKED_MASK);
2909                 if (err) {
2910                         dev_err(DEV, "Writing bitmap failed with %d\n",err);
2911                         retcode = ERR_IO_MD_DISK;
2912                 }
2913                 if (skip_initial_sync) {
2914                         drbd_send_uuids_skip_initial_sync(mdev);
2915                         _drbd_uuid_set(mdev, UI_BITMAP, 0);
2916                         drbd_print_uuids(mdev, "cleared bitmap UUID");
2917                         spin_lock_irq(&mdev->tconn->req_lock);
2918                         _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
2919                                         CS_VERBOSE, NULL);
2920                         spin_unlock_irq(&mdev->tconn->req_lock);
2921                 }
2922         }
2923
2924         drbd_md_sync(mdev);
2925 out_dec:
2926         put_ldev(mdev);
2927 out:
2928         mutex_unlock(mdev->state_mutex);
2929 out_nolock:
2930         drbd_adm_finish(info, retcode);
2931         return 0;
2932 }
2933
2934 static enum drbd_ret_code
2935 drbd_check_conn_name(const char *name)
2936 {
2937         if (!name || !name[0]) {
2938                 drbd_msg_put_info("connection name missing");
2939                 return ERR_MANDATORY_TAG;
2940         }
2941         /* if we want to use these in sysfs/configfs/debugfs some day,
2942          * we must not allow slashes */
2943         if (strchr(name, '/')) {
2944                 drbd_msg_put_info("invalid connection name");
2945                 return ERR_INVALID_REQUEST;
2946         }
2947         return NO_ERROR;
2948 }
2949
2950 int drbd_adm_create_connection(struct sk_buff *skb, struct genl_info *info)
2951 {
2952         enum drbd_ret_code retcode;
2953
2954         retcode = drbd_adm_prepare(skb, info, 0);
2955         if (!adm_ctx.reply_skb)
2956                 return retcode;
2957         if (retcode != NO_ERROR)
2958                 goto out;
2959
2960         retcode = drbd_check_conn_name(adm_ctx.conn_name);
2961         if (retcode != NO_ERROR)
2962                 goto out;
2963
2964         if (adm_ctx.tconn) {
2965                 if (info->nlhdr->nlmsg_flags & NLM_F_EXCL) {
2966                         retcode = ERR_INVALID_REQUEST;
2967                         drbd_msg_put_info("connection exists");
2968                 }
2969                 /* else: still NO_ERROR */
2970                 goto out;
2971         }
2972
2973         if (!conn_create(adm_ctx.conn_name))
2974                 retcode = ERR_NOMEM;
2975 out:
2976         drbd_adm_finish(info, retcode);
2977         return 0;
2978 }
2979
2980 int drbd_adm_add_minor(struct sk_buff *skb, struct genl_info *info)
2981 {
2982         struct drbd_genlmsghdr *dh = info->userhdr;
2983         enum drbd_ret_code retcode;
2984
2985         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_CONN);
2986         if (!adm_ctx.reply_skb)
2987                 return retcode;
2988         if (retcode != NO_ERROR)
2989                 goto out;
2990
2991         /* FIXME drop minor_count parameter, limit to MINORMASK */
2992         if (dh->minor >= minor_count) {
2993                 drbd_msg_put_info("requested minor out of range");
2994                 retcode = ERR_INVALID_REQUEST;
2995                 goto out;
2996         }
2997         if (adm_ctx.volume > DRBD_VOLUME_MAX) {
2998                 drbd_msg_put_info("requested volume id out of range");
2999                 retcode = ERR_INVALID_REQUEST;
3000                 goto out;
3001         }
3002
3003         /* drbd_adm_prepare made sure already
3004          * that mdev->tconn and mdev->vnr match the request. */
3005         if (adm_ctx.mdev) {
3006                 if (info->nlhdr->nlmsg_flags & NLM_F_EXCL)
3007                         retcode = ERR_MINOR_EXISTS;
3008                 /* else: still NO_ERROR */
3009                 goto out;
3010         }
3011
3012         down_write(&drbd_cfg_rwsem);
3013         retcode = conn_new_minor(adm_ctx.tconn, dh->minor, adm_ctx.volume);
3014         up_write(&drbd_cfg_rwsem);
3015 out:
3016         drbd_adm_finish(info, retcode);
3017         return 0;
3018 }
3019
3020 static enum drbd_ret_code adm_delete_minor(struct drbd_conf *mdev)
3021 {
3022         if (mdev->state.disk == D_DISKLESS &&
3023             /* no need to be mdev->state.conn == C_STANDALONE &&
3024              * we may want to delete a minor from a live replication group.
3025              */
3026             mdev->state.role == R_SECONDARY) {
3027                 drbd_delete_device(mdev);
3028                 return NO_ERROR;
3029         } else
3030                 return ERR_MINOR_CONFIGURED;
3031 }
3032
3033 int drbd_adm_delete_minor(struct sk_buff *skb, struct genl_info *info)
3034 {
3035         enum drbd_ret_code retcode;
3036
3037         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
3038         if (!adm_ctx.reply_skb)
3039                 return retcode;
3040         if (retcode != NO_ERROR)
3041                 goto out;
3042
3043         down_write(&drbd_cfg_rwsem);
3044         retcode = adm_delete_minor(adm_ctx.mdev);
3045         up_write(&drbd_cfg_rwsem);
3046 out:
3047         drbd_adm_finish(info, retcode);
3048         return 0;
3049 }
3050
3051 int drbd_adm_down(struct sk_buff *skb, struct genl_info *info)
3052 {
3053         enum drbd_ret_code retcode;
3054         enum drbd_state_rv rv;
3055         struct drbd_conf *mdev;
3056         unsigned i;
3057
3058         retcode = drbd_adm_prepare(skb, info, 0);
3059         if (!adm_ctx.reply_skb)
3060                 return retcode;
3061         if (retcode != NO_ERROR)
3062                 goto out;
3063
3064         if (!adm_ctx.tconn) {
3065                 retcode = ERR_CONN_NOT_KNOWN;
3066                 goto out;
3067         }
3068
3069         down_read(&drbd_cfg_rwsem);
3070         /* demote */
3071         idr_for_each_entry(&adm_ctx.tconn->volumes, mdev, i) {
3072                 retcode = drbd_set_role(mdev, R_SECONDARY, 0);
3073                 if (retcode < SS_SUCCESS) {
3074                         drbd_msg_put_info("failed to demote");
3075                         goto out_unlock;
3076                 }
3077         }
3078
3079         /* disconnect */
3080         rv = conn_try_disconnect(adm_ctx.tconn, 0);
3081         if (rv < SS_SUCCESS) {
3082                 retcode = rv; /* enum type mismatch! */
3083                 drbd_msg_put_info("failed to disconnect");
3084                 goto out_unlock;
3085         }
3086
3087         /* Make sure the network threads have actually stopped,
3088          * state handling only does drbd_thread_stop_nowait(). */
3089         drbd_thread_stop(&adm_ctx.tconn->receiver);
3090
3091         /* detach */
3092         idr_for_each_entry(&adm_ctx.tconn->volumes, mdev, i) {
3093                 rv = adm_detach(mdev);
3094                 if (rv < SS_SUCCESS) {
3095                         retcode = rv; /* enum type mismatch! */
3096                         drbd_msg_put_info("failed to detach");
3097                         goto out_unlock;
3098                 }
3099         }
3100         up_read(&drbd_cfg_rwsem);
3101
3102         /* delete volumes */
3103         down_write(&drbd_cfg_rwsem);
3104         idr_for_each_entry(&adm_ctx.tconn->volumes, mdev, i) {
3105                 retcode = adm_delete_minor(mdev);
3106                 if (retcode != NO_ERROR) {
3107                         /* "can not happen" */
3108                         drbd_msg_put_info("failed to delete volume");
3109                         up_write(&drbd_cfg_rwsem);
3110                         goto out;
3111                 }
3112         }
3113
3114         /* delete connection */
3115         if (conn_lowest_minor(adm_ctx.tconn) < 0) {
3116                 drbd_thread_stop(&adm_ctx.tconn->worker);
3117                 list_del(&adm_ctx.tconn->all_tconn);
3118                 kref_put(&adm_ctx.tconn->kref, &conn_destroy);
3119
3120                 retcode = NO_ERROR;
3121         } else {
3122                 /* "can not happen" */
3123                 retcode = ERR_CONN_IN_USE;
3124                 drbd_msg_put_info("failed to delete connection");
3125         }
3126
3127         up_write(&drbd_cfg_rwsem);
3128         goto out;
3129 out_unlock:
3130         up_read(&drbd_cfg_rwsem);
3131 out:
3132         drbd_adm_finish(info, retcode);
3133         return 0;
3134 }
3135
3136 int drbd_adm_delete_connection(struct sk_buff *skb, struct genl_info *info)
3137 {
3138         enum drbd_ret_code retcode;
3139
3140         retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_CONN);
3141         if (!adm_ctx.reply_skb)
3142                 return retcode;
3143         if (retcode != NO_ERROR)
3144                 goto out;
3145
3146         down_write(&drbd_cfg_rwsem);
3147         if (conn_lowest_minor(adm_ctx.tconn) < 0) {
3148                 list_del(&adm_ctx.tconn->all_tconn);
3149                 kref_put(&adm_ctx.tconn->kref, &conn_destroy);
3150
3151                 retcode = NO_ERROR;
3152         } else {
3153                 retcode = ERR_CONN_IN_USE;
3154         }
3155         up_write(&drbd_cfg_rwsem);
3156
3157 out:
3158         drbd_adm_finish(info, retcode);
3159         return 0;
3160 }
3161
3162 void drbd_bcast_event(struct drbd_conf *mdev, const struct sib_info *sib)
3163 {
3164         static atomic_t drbd_genl_seq = ATOMIC_INIT(2); /* two. */
3165         struct sk_buff *msg;
3166         struct drbd_genlmsghdr *d_out;
3167         unsigned seq;
3168         int err = -ENOMEM;
3169
3170         seq = atomic_inc_return(&drbd_genl_seq);
3171         msg = genlmsg_new(NLMSG_GOODSIZE, GFP_NOIO);
3172         if (!msg)
3173                 goto failed;
3174
3175         err = -EMSGSIZE;
3176         d_out = genlmsg_put(msg, 0, seq, &drbd_genl_family, 0, DRBD_EVENT);
3177         if (!d_out) /* cannot happen, but anyways. */
3178                 goto nla_put_failure;
3179         d_out->minor = mdev_to_minor(mdev);
3180         d_out->ret_code = 0;
3181
3182         if (nla_put_status_info(msg, mdev, sib))
3183                 goto nla_put_failure;
3184         genlmsg_end(msg, d_out);
3185         err = drbd_genl_multicast_events(msg, 0);
3186         /* msg has been consumed or freed in netlink_broadcast() */
3187         if (err && err != -ESRCH)
3188                 goto failed;
3189
3190         return;
3191
3192 nla_put_failure:
3193         nlmsg_free(msg);
3194 failed:
3195         dev_err(DEV, "Error %d while broadcasting event. "
3196                         "Event seq:%u sib_reason:%u\n",
3197                         err, seq, sib->sib_reason);
3198 }